Monday, May 25, 2020

Tamoanchan - Cradle of Mesoamerican civilization?


In search of a Lost Cradle

                The oldest Nahua legends speak of a mythical place called Tamoanchan, considered to be the cradle of all Mesoamerican civilizations and a sort of terrestrial paradise from which the ancestors of the Aztecs and the Toltecs would go out to repopulate the earth after a great Flood. According to the early colonial historian Bernardino de Sahagún (1500-1590 AD), the original inhabitants of Tamoanchan had come from the Sea: “They say the came to this land to rule over it…they came from the sea on ships, a multitude of them, and landed on the shore of the sea, to the North…from there they went on, seeking the white mountains, the smoky mountains…led by their priests and by the voice of their gods. Finally, they came to the place that they called Tamoanchan…and there they settled [1].” These learned men invented the sacred books, the count of destiny, the book of years and the book of dreams. Tamoanchan has been since identified with a number of places in ancient Mexico, including Tula and Teotihuacan, but these are likely later associations from a time when its true location had already become lost and shrouded in legend. 

The oldest Mesoamerican Civilization

The earliest historical traditions locate Tamoanchan far from the coast, in the province of Cuauhnahuac near present-day Cuernavaca. From there, the tribes that would become the ancestors of all later Mesoamerican civilizations spread to the North, East and South to give rise to the civilizations of the Toltecs, the Olmecs and the Maya. These people called themselves the Chan, the “People of the Serpent”, and the very name of Tamoanchan may have come from them [2].
In 1911, the bishop of Cuernavaca, Francisco Plancarte y Navarrete formulated a theory that Tamoanchan was once a real place, whose ruins were to be found in the Southern part of the state of Morelos. He believed that the civilization of Tamoanchan was older even than that of the Olmecs and had spread throughout Mesoamerica from a single point of origin. A few years earlier, Plancarte had collected rumors of the discovery of immense stone ruins in the remote mountains of the Sierra de Huautla, to the South of Cuernavaca, which he believed could point to the location of Tamoanchan. These ruins were of a cyclopean kind, entirely different from the crude constructions of the Aztecs and of an antiquity so remote that no record of their builders had survived in the records of the Conquest.
A corner at the base of the megalithic ramparts of Chimalacatlan, where the walls rise to a height of nearly 10 meters (33 ft). The foundations of the walls rest directly on the natural bedrock, making a precise dating of these structures extremely problematic. [Photo by Author] 
A view of the great megalithic walls surrounding the Acropolis of Chimalacatlan. Some of the stones measure over 3 meters long, with an estimated weight of between 5 to 8 tons [Photo by Author]
“A most ancient and famous work”

The ruins were again rediscovered in 1948 by the archaeologist Florencia Müller, who similarly considered them to be of very great antiquity. In the absence of datable remains, she tentatively attributed them to the Olmecs, whose presence in the region is attested since at least 1,200 B.C. [3] The largest structures were located near the village of Chimalacatlan and consisted of a number of megalithic stone platforms occupying the artificially-leveled summit of the Cerro del Venado. The walls survived up to a height of nearly 8 meters in certain points and were built of huge blocks of stone measuring up to 3 meters long, laid in regular rows without mortar. Immense efforts had certainly gone into the construction of the massive walls and terraces, yet no trace could be found of the original builders and inhabitants. The only ceramic and a few tombs found at the site dated to a much later period than that of the construction of the walls. Nor was there any trace of the structures that were intended to be built on top of the megalithic platforms.
One large stone platform measured some 40 by 30 meters and would have once contained a sunken courtyard also lined with megalithic stone blocks. A partially carved rock surface and some giant monoliths on the upper terraces of the site are all that remains of a great unfinished structure that may have been a temple. Some of the stones that had been prepared for the construction, only partially detached from the natural bedrock, would have weighted as many as 20 tons. A number of cylindrical column shafts, each measuring about 2.5 meters long, were also found nearby. More constructions were certainly planned near the summit of the hill, where the rock was artificially flattened and carved, but these were either dismantled or were never built. Even so, the ruins of Chimalacatlan are not only the largest and best-preserved examples of cyclopean megalithic architecture in all of Mesoamerica, but also quite possibly the oldest.   
The wall of the upper terrace on the Acropolis of Chimalacatlan, built of large megalithic stone blocks. The top of the lower platform contains a large sunken courtyard that has not been excavated. [Photo by Author]
Another view of the Northwest corner in the lower platform walls of Chimalacatlan, preserved to a height of nearly 10 meters. [Photo by Author]
A detail of the very precise mortarless construction of the walls of Chimalacatlán, a style which may be called "cyclopean" and of which only few other examples exist in all of Mexico and Central America. [Photo by Author]
A nearly perfect section of a megalithic wall at Chimalacatlan, running alongside a sort of alley between two building platforms. [Photo by Author]
Lost Cities of the Mexican Highlands

With the exception of some consolidation work conducted by the Mexican National Institute of History and Anthropology (INAH) during the early 2000’s, and in spite of their enormous historical importance, the ruins of Chimalacatlan remain today in a state of near complete abandonment. Yet they are by no means the only megalithic ruins in the area. When the famous explorer and archaeologist William Niven visited the region in 1891, he recalled walking for miles among the ruins of ancient habitations that would have once formed part of an immense prehistoric city: “broken walls, ruined buildings, huge in size beyond comprehension…marked the slopes as far as the eye could reach”; he later wrote in his diaries. [4] Some of the buildings he encountered were larger than those of Mitla and covered an immense area: “It must have been an immense nation that once dwelt here”, he observed; and this city, or chain of cities, must have been fully as large as Babylon, or Thebes, or Memphis, or other famous cities of antiquity.”
The very peculiar landscape of bushes and cactuses that characterizes the southern portion of the state of Morelos and the north of Guerrero, making exploration and progress through the harsh terrain extremely difficult. [Photo by Author]
In January 2019 we were accompanied on an expedition into the Sierra de Huautla by the responsible for Culture of the municipality of Tlaquiltenango, Prof. Rogelio Ortega Gallardo. Our goal was to photograph the ancient ruins that were said to exist near the village of Huaxtla. Just as described by Niven over a century ago, the ruins cover an immense area and extend over several hilltops and across great ravines. Everywhere one could see the remains of fallen walls, badly dilapidated pyramids and stone platforms. Although the thick vegetation only allowed to appreciate a small portion of the site, the style of the ruins appeared to be entirely similar to that of Chimalacatlan, as consisting of huge megalithic stone blocks arranged in regular courses. Unfortunately, only a small portion of the walls remained intact, the rest having fallen long ago. The local villagers confirmed that the ruins extend for several miles in all directions, but no systematic mapping of the site has ever been carried out. According to information provided by Prof. Ortega, at least 41 sites with megalithic architecture are known to exist within the municipality of Tlaquiltenango alone, which would have formed part of a nearly continuous chain of cities. There are moreover legends of a network of ancient tunnels extending throughout the entire region, including a walled-up entrance under the ruins of the colonial convent of Las Bovedas.
A large collapsed structure in the ruins of Huaxtla, showing portions of a megalithic wall of large basalt stone blocks. [Photo by Author]
A corner construction of large megalithic stone blocks in the ruins of Huaxtla. The incline of the walls and the rounded corners of the walls are reminiscent of the megalithic structures of Peru. Note the use of smaller stones for the filling and the upper portions of the walls, perhaps indicative of two different phases of construction. [Photo by Author]
For miles around Huaxtla, the hills are covered with remains of collapsed walls and massive stone ramparts, exhibiting a kind of cyclopean mortarless construction that has few parallels in Mesoamerica. Although it is impossible to provide an accurate estimate, hundreds of thousands of tons of hard basalt stone were carved and put into place to build the massive walls and fortifications of Chimalacatlan and Huaxtla. [Photo by Author]
The unknown megalithic civilization of Mexico

The mysterious ruins that are found in the Southern part of the state of Morelos are among the largest to be found in the entire American continent and could also turn out to be among its oldest. They belong to a time possibly earlier still than that of the Olmecs, and may indeed turn out to be those of the legendary lost city of Tamoanchan – The Cradle of Mesoamerican civilization. A mighty megalithic civilization once reigned over much of Central Mexico, which left behind the great stone ruins of unknown date that the later Toltec, Maya and Aztec invaders encountered and appropriated. The quality of the stonework of Chimalacatlan, as well as the many more examples of rock-cut surfaces and megalithic architecture found throughout Central Mexico, would put this civilization on a par, if not with those of Peru, at least with that of the equally mysterious builders of the great cyclopean cities of Italy, Greece and Turkey. We can only hope that in future years more of the past of this fascinating region will be revealed as its ancient cities are also rescued from centuries of oblivion.  

Note: This article first appeared on Ancient Origins on February 9th, 2019: Link here

References:
[1] Bernardino de Sahagún, Codice Matritense de la Real Academia, folio 191,192
[2] Francisco Plancarte y Navarrete, Tamoanchan: El Estado de Morelos y el principio de la civilizacion, Imp. El Mensajero, Mexico, 1911
[3] Florencia Muller, Chimalacatlan, Acta Anthropologia, Mexico 1948
[4] Robert S. Wicks and Roland H. Harrison, Buried Cities, Forgotten Gods, Texas Tech University Press, 1999, p. 43
[5] Mario Cordova Tello, Juan Pablo Sereno Uribe, Sur de Morelos: Chimalacatlan, INAH, http://consejoarqueologia.inah.gob.mx/wp-content/uploads/1_proychimala.pdf

Monday, March 30, 2020

The Megalithic Ruins of Ancient Mexico - Part V



The Forgotten Tombs of Guirún and the search for the largest megalith in North America

The valley of Tlacolula in Central Oaxaca, Mexico, is home to one of the largest concentrations of megalithic monuments in Mesoamerica. The origin of these structures is conventionally attributed to the Zapotec and Mixtec peoples, who occupied the area since at least 500 B.C. Their largest and most important sites were Monte Alban and Mitla, characterized by a sophisticated stone architecture, magnificent underground tombs and advanced metalworking techniques.
The palaces and underground tombs of Mitla, with their intricate stone decoration, would cause the greatest impression in the early Spanish Conquistador and in later travelers during much of the 17th and 18th Century. Early chroniclers marveled at the extraordinary workmanship of these structures and the immense size of the stones – buildings which were “prouder and more magnificent than any that they had hitherto seen in New Spain. [1]”
These early chroniclers described vast halls supported by round pillars consisting of one stone, and immense doorways built with huge monolithic lintels and jambs. An even greater marvel were the stone mosaics that ornated the walls, consisting of an infinite number of small rectangular stones “as smooth and regular as if they had all come from one mould”. And, more wonderful still, these stones were “adjusted without a single handful of mortar”, a feat “inexplicable even to the greatest architects”. All of this was accomplished, according to another source, wholly “without tools, with nothing but hard stones and sand. [2]”
The palaces of Mitla and their impressive stone architecture have been covered at length in a previous article on this blog, which can be accessed here.

A few years ago I came across a brief description and some black and white pictures of what appeared to be an enormous cruciform megalithic structure in the mountains near Mitla. The report in question had been published in 1909 by the American archaeologist Marshall H. Saville and only named the site as Guiaroo [3].
Initial enquiries into the location of the mysterious ruin in 2017 turned out to be largely unsuccessful. We were, however, able to locate another interesting megalithic tomb on the grounds of the abandoned Hacienda of Xaaga (See here for a description of our find).
Finally, in March of 2020 our friend Ludovic Celle from Oaxaca City, who had himself visited the site a couple of years earlier and provided GPS coordinates, put us in touch with a local guide, Misael Martinez, who also knew the location of the ruins. His experience proved invaluable not only in locating the cruciform structure, but also a second tomb and various other ruined structures not mentioned by Saville in his initial report of the site.  
The "Palace" of Guirún, in the Upper Group. The Temple of the Two Rooms appears as a large stepped pyramid on the opposite side of the rectangular Plaza. The cruciform chamber is located on a ridge less than 200 meters from the Palace. [Photo by Author]
The ruins of Guirún (or Guiaroo) are located on a hilltop some 5 kilometers to the NE of the little town of Xaagá, amidst spectacular cliffs and deep canyons. The site was studied by Gary M. Feinman and Linda M. Nicholas in 2004, which conducted a comprehensive survey of the remaining structures but did not conduct any excavations [4].
The largest building is called the “Palace of the Two Rooms”. It is in fact a group of four ceremonial structures facing a square plaza with a large terraced pyramid on the eastern side. The temple on the top of the pyramid is still in a reasonable state of preservation and consists of two large rooms approached by a stairway, from which the entire complex receives its name. The plan of the structure is similar to that of the largest palaces at Mitla, but lacks the same high-quality workmanship and stone decoration. It is quite possible that underground tombs may exist under each of the ceremonial platforms to the North and to the East. There are also traces of fortifications and of what could be a small Mesoamerican ball game to the South of the palace.
The cruciform structure, often called a “tomb”, is found less than 200 meters from the main Palace, on another low ridge covered in bushes and shrubs, next to a ruined pyramidal mound some 10 meters high.
A view of the Cruciform chamber looking North. [Photo by Author]
Another view of the Cruciform chamber looking East. Note the immese size of the stone blocks forming the walls and the perfect jointing along the exposed face. [Photo by Author]
There are few words to describe a structure so entirely unique in the panorama of Mesoamerican architecture. Its measurements are given by Saville as 32.8 ft. (10 meters) along the East-West axis and 28.6 ft. (8.7 meters) along the North-South axis. It is in the shape of a cross, precisely oriented to the cardinal directions, and has the entrance to the West. The walls, up to 2.5 meters (7.5 ft) high, consist of enormous megalithic stone blocks laid without mortar or cement. The largest stone block, located on the southern wall of the western arm, measures 12.5 by 3.3 by 3 ft, or approximately 3.8 by 1.0 by 0.9 meters, weighting an estimated 10 tons or more in its finished state. A total of 52 stone blocks were employed for the construction of the chamber, which remained unroofed. The interior walls, with the sole exception of the terminal wall of the southern arm, are entirely decorated with intricate geometric pattern resembling the mosaic stonework at Mitla – except that the carvings were applied here directly on the stone surface. The patterns run on three bands, the ones at the bottom and the top resembling waves or swastikas, with a labyrinthine design in the middle band. Traces of red and white paint still survive in places.
The large stones were pinched into place by means of holes in the back of them, where levers were most certainly inserted. One huge stone block lying near the chamber also shows two enigmatic U-shaped bosses in relief that served possibly for transportation.
The author posing next to the largest stone block on the souther wall of the western arm. [Photo by Author]
A close-up view of the largest stone block on the southern wall of the western arm. Note the curious embossment in the middle, which probably served to ensure a tight fit the other stones. Similar features have been documented at other megalithic sites, such as at Ollantaytambo in Peru. [Photo by Author]
Another view of the western and southern arm of the cruciform structure, each consisting of a single stone. Notice the holes in the back of the stones, possibly for the insertion of levers. [Photo by Author]
It has been suggested that the “tomb” was left unfinished, due to the presence of several large construction blocks abandoned in the vicinity and the absence of a roof. This seems to contrast, however, with the evidence from the exquisitely carved decoration and traces of paint on the inside. Saville remarked that the debris filling the chamber at the time of discovery did not contain the slightest trace of human remains or other pottery fragments by which the structure could be dated. There is also no trace of a floor, so it is not clear whether the structure actually rests on bedrock or continues underground. Compass readings show that the longest arm is oriented about 17 degrees to the East of North. As such, Guirún would join a long list of Mesoamerican sites with anomalous orientations, including Teotihuacan, Chichen Itzá and Tula, which are all oriented between 15.5 and 17 degrees to the East of North.
Our friend Ludovic Celle from Oaxaca also noticed a close similarity between the geometric patterns that ornate the walls of the cruciform structure of Guirún and those of the Palace of the Columns at Mitla. These differ significantly from the mostly plain decoration of other underground tombs, which only contain isolated mosaic panels. Ludovic also created a great 3D reconstruction of the tomb which may be accessed from the following link: https://www.artstation.com/artwork/kAG8y

It is possible that the cruciform structure of Guirún was therefore never intended as a tomb, but as a ritual chamber or astronomical observatory.  
A view of the interior of the cruciform chamber, looking East, from which it is possible to appreciate the remarkable decoration on the inside. [Photo by Author]
Another view from the interior of the cruciform chamber, looking North. It is possible to appreciate the three different patterns that form the lower, middle and upper band. [Photo by Author]
At a distance of about one mile from the Upper Group and the cruciform structure, we found the remnants of another ruined palace supported by massive stone embankments. Inside the courtyard of this second palace we found the entrance to another tomb, which was also briefly described by Saville. This is a cruciform structure, measuring some 24 by 22 ft, or about 7.3 by 6.8 meters along its two horizontal arms, built entirely underground of loose cemented stones covered with a roof of large megalithic flagstones. The workmanship of this structure, which was most certainly a tomb, appears rather crude if compared to the other examples of cruciform tombs from Mitla and Xaaga, and does not share the least similarity with the exquisite finishing of the cruciform structure in the Upper Group, neither in the use of large megalithic stones nor in the quality of the decoration. The walls were covered in plaster and painted bright red and white. Only traces of the original plastering and paint remain. Of a third megalithic tomb described by Dupaix in 1805 as containing a monolithic stone pillar in the middle and carved mosaic panels, we could find no trace.   
The very narrow entrance to the other small cruciform chamber in the Lower Group of ruins at Guirún [Photo by Author]
A view of the interior of the small cruciform chamber in the Lower Group. The roof is formed of enormous megalithic stone slabs, but the general construction appears quite crude. The walls still retain traces of red and white paint. [Photo by Author]
Our attention was then drawn to some of the nearby quarries. A large prehispanic quarry was first reported by archaeologist Nelly Robles in 1994 at a site known as La Cuadrada, about one hour from Guirún, containing some 57 worked pieces. Unfortunately, the limited time available did not allow for a thorough examination of this site. Most of the stones seem to be of comparable size to some of the largest stone blocks at Guirún. We explored instead another stone quarry located near the village of Xaagá, near a rock face known simply as La Peña, where prehistoric rock art is also visible. We found there one very large stone, possibly a lintel, measuring approximately 4 by 1.5 by 1.25 meters. The approximate weight of the stone would be in the range of 15 to 20 tons. Our guide drew our attention to the fact that most quarries are located in close proximity to small streams, implying that water was perhaps employed to facilitate the cutting.
A view of the megalithic stone quarry at the site of La Peña, near the village of Xaaga. [Photo by Author]
The largest stone block still lying in the quarry at the site of La Peña, measuring some 4 meters long - most likely an unfinished lintel or pillar. [Photo by Author]
We also learnt of one immense stone block lying on a mountain slope near the village of Unión Zapata, some 2 kilometers to the East of Mitla. The site is known as Guigosj, meaning “fallen stones”. Archaeologist Nelly Robles describes at least 6 huge stones “of uncommon size” lying horizontally in the quarry. In her 1994 report, Dr. Robles observed that “at first, the enormous size and monumentality of the stones made us doubt that these could have been quarried intentionally; yet the perfection of the cuts and their geometric shape indicated otherwise [5].” The largest stone would have had the enormous dimensions of 12 meters long by 4 meters wide and 2.5 meters high. Assuming a specific weight of the stone between 2.3-2.5 tons per cubic meter, its weight could be close to 300 tons.
Also in this case, however, time limitations did not allow us to fully explore the site, which we will leave for a future expedition.
Various large stones found abandoned in the vicinity of the cruciform structure in the Upper Group of ruins of Guirún. Note the holes in the back of the large lintel and the curious U-shaped bosses on the other stone block in the foreground - probably another transporation device. [Photo by Author] 
Judging from the enormous number of stones still abandoned in the quarries, and their immense size, it is clear that a colossal building program in the valley of Tlacolula and Mitla was suddenly interrupted and remained unfinished. In her 1994 study, Dr. Nelly Robles documented at least nine major quarries in the area of Mitla alone, containing an estimated 200 megalithic stone blocks in various stages of completion, the majority of which in the 5-10 tons range. This would be enough to build at least four cruciform structures like the one at Guirún.
It is not clear what circumstances led to the abandonment of such a colossal building program. When the first Spanish Conquistadors visited Mitla in the 1520’s, they found the city already in ruins, after the Aztecs had conquered and sacked it in 1494. Perhaps it was the Aztec conquest that caused the abandonment of the quarries, or maybe this occurred much earlier. A recent 2019 study found evidence of a massive landslide to the north of Mitla that may have contributed to the abandonment of the site and the collapse of Zapotec civilization. The same study also found evidence of what could be buried pyramids or structures under the landslide, suggesting that the avalanche could have occurred within historical times [6].

Another mystery is the technique employed for cutting and transporting the enormous stone blocks. The stone itself is a type of andesitic toba, which would have required stone or metal tools for its extraction and polishing. A further question is posed by the intricate grecques and ornamentation found on some of the blocks – the finest being those that decorate the walls of the cruciform structure of Guirún. The perfect right angles and minute details suggest almost the use of molds, as the design is always repetitive and perfect, without the slightest error or deviation. One may also consider the possibility that the stone is in fact a type of geopolymer and that it was cast into place rather than quarried and transported. This possibility may only be confirmed by future studies and analyses.
While this is only a suggestion for now, there is something in the obsessive repetition of geometric patterns and designs in the palaces of Mitla and the cruciform structure of Guirún that suggests almost a form of writing or a mathematical code, whose true meaning may however always escape us.
A close-up view of some of the geometric patterns in the interior of the cruciform structure of Guirún. Were these intricate pattners carved or molded on the stone? [Photo by Author]
The ruins of the valley of Tlacolula and Mitla represent a unique example of megalithic architecture displaying a workmanship and a tendency towards monumentality unknown in the rest of Mesoamerica. These magnificent structures appear as if out of nowhere, and are the expression of a tradition of working in stone that had already become extinct long before the time of the Spanish conquest.
        
References
[1] Toribio de Benavente Motolinia (1482-1568), Historia de los Indios de la Nueva España
[2] Francisco de Burgoa, Geográfica Descripción, 1674
[3] Marshall H. Saville, The Cruciform Structures of Mitla and Vicinity, Putnam, 1909
[4] Gary M. Feinman and Lind M. Nicholas, Hilltop Terrace Sites of Oaxaca: Intensive Surface Survey at Guirún, El Palmillo and the Mitla Fortress, Field Museum of Natural History, Chicago, 2004
[5] Nelly M. Robles Garcia, Las Canteras de Mitla, Vanderbilt University, 1994, pp. 17-19
[6] V. H. Garduño-Monroy, et al., The Mitla Landslide: An event that changed the fate of a Mixteco/ Zapoteco Civilization in Mesoamerica, International Journal of Geophysics, vol. 2019, https://doi.org/10.1155/2019/5438381

Note: All the pictures on this page are intended for non-commercial use only and may be reproduced on other websites or publications so long as the source is cited. Exploration of the site was conducted with the help of certified guides to ensure the preservation of archaeological remains and the natural environment. 

Friday, August 9, 2019

The Lost City of the Eagle


A mysterious Olmec presence in the Mixteca

     Huehuepiaxtla is a small town located in the heart of the Mixteca region, 150 kilometers (100 miles) south of Puebla. Overlooking the town is a huge isolated peak, called by locals ‘La Peña’ – The rock. Tradition has it that the mountain was home to the first inhabitants of the region, who were later turned into stone by the gods.
The municipal president of Huehuepiaxtla, Dr. Florencio Dominguez (left) and our guide German (right) near a section of megalithic stone wall decorated with the image of an eagle on the summit of the Great Rock of Huehuepiaxtla [Photo by Author]
I first became interested in this mysterious site after coming across pictures online of what appeared to be several broken stelas and bas-reliefs [1]. There were also rumors of more extensive ruins near one of the peaks, including great stone walls and a broken obelisk. After contacting the local authorities, the municipal president Dr. Florencio Domínguez was kind enough to arrange for a guide and equipment to climb the peak and document whatever ruins we might find on top.

Upon arriving in Huehuepiaxtla, the summit of the Peña was still entirely shrouded in the morning mist. After the necessary preparations, we approached the cliff from the West. The peak now loomed directly a full 450 meters (1,470 ft) above us and the Rio Mixteco running below. Luckily, no rain had fallen in the past few days, so the rock was quite dry. Florencio explained that had it rained the night or the day before, the rock would have been too slippery to climb. Our guide, German, was an expert climber and one of very few people in town who know the difficult trail to the top.
The Great Rock of Huehuepiaxtla, as seen from the Mixtec River running below and around it. [Photo by Author]
Already at 10:00 am the temperature was nearly 30°C. Near the base of the cliff, we walked through a large flat area, trapezoidal in shape, which appeared to have been artificially leveled with steep embankments on all sides. Some overgrown mounds on the western side suggested this might have been a ceremonial plaza flanked by pyramids.

From there, a small trail led directly to the base of the cliff. Some steps and ledges had been originally carved in the rock, but these were now very worn. The path required to go through some very steep sections of exposed bedrock, which made the climb particularly difficult even in dry weather.
The steep trail leading up to the summit of the Rock of Huehuepiaxtla. [Photo by Author]
Another section of the difficult trail along the exposed cliff face, overlooking the village of Huehuepiaxtla and the Mixtec River below. [Photo by Author]
Along the trail we observed several pieces of obsidian and fragments of pottery. About half-way up, we passed through a set of terraces with massive stone retaining walls. The quality of the visible stonework varied, with some sections composed of huge, finely fitted rectangular stone blocks and others formed of rough boulders. The stone appeared to be a kind of basalt, which was probably sourced locally from the slopes of the great rock itself. 
Dr. Florencio holding a piece of obsidian, probably a small arrowhead, found along the trail to the summit. Note: No artifact was removed during the exploration, and all pieces were returned to their original location. [Photo by Author]
The handle of a broken ceramic vessel. Note: No artifact was removed during the exploration, and all pieces were returned to their original location. [Photo by Author] 
A partially exposed section of a megalithic stone wall about half-way towards the summit of the Great Rock. Some of the larger stones in the picture measure up to 3 meters (10 ft) long. The style of construction is reminiscent of Chimalacatlan and Huaxtla, two early Pre-Classic sites in the state of Morelos.[Photo by Author]
A retaining wall formed of large roughly shaped boulders laid without cement. [Photo by Author]
Some large broken sections of megalithic stone walls, like the one in the picture, suggest the existence of buried monumental structures on this side of the hill. [Photo by Author]
After some more climbing, we finally reached the summit at about noon. The summit consists in fact of a small, mostly level plateau or ridge in between two separate peaks, one to the East and the other to the West. This plateau contained extensive remains of ancient constructions and some overgrown mounds. However, the thick vegetation made it impossible to make out but the general outline of most of the structures.
The small cross located on one of the peaks of the Great Rock of Huehuepiaxtla, overlooking the town and the river below. [Photo by Author]
A rock ledge overlooking the Mixtec River 450 meters below. Note how the rock appears to have been artificially leveled and cut into steps. Several glyphs and rock carvings can be found in this area. [Photo by Author]
Opening our way with machetes through the thick undergrowth we reached the first of the two peaks, where a small cross has been erected that is visible from the town below. From there, it was possible to descend towards a rock ledge directly overlooking the river 450 meters (1,470 ft) below. The ledge appeared to have been artificially leveled and carved into steps or terraces, each just a few meters wide. Various glyphs and symbols were apparently carved on the rock, suggesting that this was in fact a very important point in the sacred geography of the area. Among the glyphs that we could make out were two apparent calendar symbols including the numeral ‘9’ and the figure of an eagle or vulture. The uppermost terrace, where the eagle bas-relief could be seen, was once delimited by a massive megalithic stone wall that emerged directly from the natural bedrock. The joints between the stones looked extremely tight, except for a point where some tree roots had partially dislodged a large vertical block. According to our guide, the peculiar arrangement of the stones around the eagle glyph indicated a hidden passageway. What made the existence of a passage through the rocks very likely was the presence of another bas-relief, depicting a crouching jaguar, which appeared to continue beyond the joint into the wall. From this point, it was also possible to see the entrance of another cave near the base of the cliff. Local traditions speak of vast subterraneans under the Peña. One of these is said to be covered in carvings and mysterious figures, but no entrance to these subterraneans is presently known.
A mysterious glyph on one of the rocks near the eagle carving. [Photo by Author]
A section of what appears to be a megalithic stone wall with the carving of an eagle and a calendar glyph with the numeral '9'. Note the peculiar arrangement of the stones to the right of the carving, allegedly concealing the entrance to a subterranean. [Photo by Author]
A close-up view of the eagle glyph on the same rock face. The figure of a jaguar can be faintly made out to the right of it. [Photo by Author]
Another glyph near the edge of the rock overlooking the Mixtec River some 450 meters below. The glyph is inscribed inside a circle and is also accompanied by the numeral '9', represented by a bar with four dots. [Photo by Author]
From this rock ledge, we continued along a trail overlooking the precipice in the direction of a small plateau separating the two peaks. There, in a small plaza facing an ancient overgrown pyramid lay one of the most fascinating monuments of antiquity in this parts of Mexico. It was a huge fallen stela, some 3 meters (10 ft) long, carved on one side with the image of an undefinable creature. It had slightly open legs, from which emerged what appeared to be a tail. Hands and feet looked like claws, but the creature appeared otherwise humanoid. The head could be that of a bat, with large pointed ears. The presence of clearly marked breasts suggested that the subject represented was a female. It was a unique type of stela, for the deeply embossed relief and the frontal depiction of the main figure. The stela was probably part of a pair that had been once erected in front of the main pyramid. Another fragmentary stela, now in the main square of Axutla, is also said to have been found at Huehuepiaxtla, and shows a very similar iconography. In this latter case, however, the figure depicted looks clearly human, possibly a dancer. The stela of Axutla is also significantly smaller, and the carving much shallower and less precise.
A large fallen stela in front of the main pyramid on the summit of the Great Rock of Huehuepiaxtla. The figure depicted is vaguely anthropomorphic, with claws in the place of hands and a curious head with pointed ears resembling a bat. [Photo by Author]
Another view of the same fallen stela with a smaller stone block that may have been its base or an offering table, also near the base of the main pyramid. [Photo by Author]
A view of what appears to be the main pyramid of the site, with its partially exposed stone core. [Photo by Author]
After passing the main pyramid, the trail led in the direction of the second peak. About half-way up towards the summit, we found a pair of strange megalithic arrangements. The first apparently consisted of some huge boulders, each probably weighting 1 ton or more, roughly piled up to form some sort of cairn about 3 meters (10 ft) high. A short distance from this first arrangement was a second one, consisting of even larger basalt columns stacked together as to form a fence. I found the resemblance to the famous Olmec megalithic tomb of La Venta particularly striking, especially for the use of prismatic basalt columns. From there, we entered another small plaza delimited on three sides by a stone wall. The wall had entirely collapsed, but the debris still reached up to 1 meter (3 ft) in height. The purpose of the wall was probably to delimit a sacred precinct in front of another very ruined pyramid that occupied the summit of the second peak. A large hole could be seen where a temple would have stood on top of the pyramid, probably dug by looters in search of treasure. From this vantage point it was possible to see at a distance of some 5 kilometers another giant rock, known as the Peña de Tlaxcuapan, where more ancient ruins are said to exist. 
A cairn formed of huge megalithic stone boulders on the summit of the Great Rock of Huehuepiaxtla. It is possible that these stones once formed part of some large fallen structure. [Photo by Author]
A curious megalithic arrangement consisting of several basalt columns, each up to 3 meters (10 ft) high. This is reminiscent of the famous Olmec tomb of La Venta, probably early Pre-Classic. [Photo by Author]
A view of the Rock of Tlaxcuapan from the summit of small pyramid that occupies the second peak of the Great Rock of Huehuepiaxtla. [Photo by Author]
We then began a difficult descent along a small overgrown pathway towards a spot where our guide German claimed a huge broken stela or obelisk could be found. After a turn, we found ourselves in front of an immense stone wall, formed of huge megalithic blocks up to 4 meters (13 ft) long, laid in regular courses without mortar or cement. The wall apparently formed the side of a large stone platform or terrace, on top of which rose a second platform also lined with great megalithic stones. The overall impression was one of extraordinary antiquity. Near the base of the lower platform we found another curious arrangement of basalt columns, each probably 3 or 4 meters  (10-13 ft) long, placed horizontally as to form a kind of bridge. We could not determine whether the columns actually formed part of the roof of some buried structure, but this seemed very likely. A short distance from there we reached the ‘Stone of Sacrifice’. This was in fact an enormous broken stela, which may have stood up to 6 meters (20 ft) tall when still erect, but which now lay broken in four parts. The decoration on the stela betrayed a clear Olmec influence. Although now badly defaced, it probably depicted a ruler crowned by what appeared to be a very elaborate headdress.
A set of huge monolithic basalt columns laid horizontally as to form a sort of bridge, possibly the roof of a tomb. [Photo by Author]
A section of a massive megalithic wall forming the side of a terrace. Some of the stones pictured above measure over 3 meters (10 ft) long, with a weight of several tons. [Photo by Author]
Another view of the same megalithic terrace, formed of massive prismatic basalt columns laid in rows without mortar or cement. Probably early Pre-Classic. [Photo by Author]
More ruined megalithic stone walls, partially covered by vegetation. [Photo by Author]
A view of some other megalithic structures on the upper terrace, also built of huge blocks of prismatic basalt laid without mortar or cement. [Photo by Author]
The great broken stela known as the 'Stone of Sacrifice' at the base of the lower terrace. The fragment on the left shows a badly eroded head and torso, while the larger fragment on the right contains part of an elaborate headdress. The style of the sculpture is typically Olmec. When erect, the stela (now broken in at least four pieces) would have stood at least 6 meters (21 ft) tall. [Photo by Author]
More Olmec-style carvings could be found near the base of the Peña. These appeared to have also been part of another large broken stela. A glyph accompanied by the numeral ‘4’ could be seen on one of the fragments.
Fragments of a large broken stela found near the base of the Rock of Huehuepiaxtla. A glyph with the numeral '4' can be clearly made out in the center of the picture. [Photo by Author]
More fragments of the same broken stela, with apparently Olmec carvings. [Photo by Author]
The rock of Huehuepiaxtla was certainly a very important site in ancient times, and it is a pity that so little is known about it. Everything suggests that this was a major ceremonial center in the Pre-Classic period, probably as early as 1,000 B.C., and may be related to the other Olmec sites in the region, at Chalcatzingo, Chimalacatlan, Huaxtla, Teopantecuanitlán and Juxtlahuaca.

The possibility of a connection between these sites is further suggested by the fact that a line drawn through Chimalacatlán and Huaxtla (as described in a previous article [2]) leads directly to the rock of Huehuepiaxtla. A continuation of the same line crosses the nearby rock of Tlaxcuapan and ends at Apoala. This alignment of five sites, all displaying unusual megalithic architecture, appears to be hardly coincidental.
It is only to be hoped that the Mexican Institute of History and Anthropology (INAH) also gathers an interest in this now forgotten site and helps preserve it from looting for the benefit of future generations.  
A herd bathing in the Mixtec River, at the base of the Great Rock of Huehuepiaxtla. [Photo by Author]
Another view of the Rock of Huehuepiaxtla, standing in monumental isolation in the hilly landscape of the Mixteca. [Photo by Author]
Part of a broken stela, allegedly from Huehuepiaxtla, found in the main square of the town of Axutla. [Photo by Author]
Another stone fragment in the main square of Axutla, possibly from the same stela. [Photo by Author]
References

Unfortunately, no bibliography could be found concerning Huehuepiaxtla and its ruins, as the site is presently unpublished and no mention of it exists in academic literature. 

[1] La Gran Peña, origen de mitos y leyendas en la Mixteca poblana y oaxaqueña, in MunicipiosPuebla.mx, December 22, 2013 – On-line resource: http://municipiospuebla.mx/nota/2013-12-22/acatl%C3%A1n-de-osorio/la-gran-pe%C3%B1a-origen-de-mitos-y-leyendas-en-la-mixteca-poblana-y

[2] Marco M. Vigato, Tamoanchan, in Search of the Lost Cradle of Mesoamerican Civilizations, in Ancient Origins, February 9, 2019 – On-line resource:https://www.ancient-origins.net/ancient-places-americas/tamoanchan-0011452

Also on this blog: The Location of the Mesoamerican ‘Hall of Records’ at Chalcatzingo: http://unchartedruins.blogspot.com/2016/11/the-location-of-mesoamerican-hall-of.html - Note the striking similarity between the profile of the rock of Chalcatzingo and the Peña of Huehuepiaxtla, as if to suggest that these may have in fact been sister sites belonging to the same culture