29 March 2023 The Future is the Product of the Past

New Evidence could Change the Date People First Arrived in North America

While investigating the origins of agriculture, researchers made an unexpected discovery.

According to an unexpected finding made by an Iowa State University researcher, the earliest people may have arrived in North America more than 30,000 years ago – over 20,000 years earlier than previously assumed.

Andrew Somerville, assistant professor of world language and cultural anthropology, said he and his colleagues made this discovery while studying the origins of agriculture in the Tehuacan Valley in Mexico.  As part of this work, they wanted to date the earliest human occupation of Coxcatlan Cave in the valley, so they obtained radiocarbon dating of several rabbit and deer bones that were collected from the cave in the 1960s as part of the Tehuacan Archaeological and Botanical Project. The date of the bones took the work of Somerville and his colleagues in a different direction.

The date range of the bone samples at the bottom of the cave ranged from 33,448 to 28,279. The results were published in the academic journal “Latin American Antiquity“. Somerville said that although previous research did not determine the age of the objects at the bottom of the cave, he did not expect such an old age. These findings add to the debate about a long-standing theory that the first humans crossed the Bering Land Bridge into the Americas 13,000 years ago.

“We weren’t trying to weigh in on this debate or even find really old samples. We were just trying to situate our agricultural study with a firmer timeline,” Somerville said. “We were surprised to find these really old dates at the bottom of the cave, and it means that we need to take a closer look at the artifacts recovered from those levels.”

Somerville says the discoveries provide researchers with a better understanding of the region’s chronology. Earlier research relied on charcoal and plant samples but says bones were the better material for dating. However, questions still remain. Most importantly, is there a human connection to the lower layer of the cave where the bones were found?

Coxcatlan Cave
Coxcatlan Cave. Source

To answer that question, Somerville and Matthew Hill, ISU associate professor of anthropology, plan to take a closer look at the bone samples for evidence of cut marks that indicate the bones were butchered by a stone tool or human, or thermal alternations that suggest the bones were boiled or roasted over fire. He says the possible stone tools from the early levels of the cave may also yield clues.

“Determining whether the stone artifacts were products of human manufacture or if they were just naturally chipped stones would be one way to get to the bottom of this,” Somerville said. “If we can find strong evidence that humans did in fact make and use these tools, that’s another way we can move forward.”

It took a year to find the bones

The Tehuacan Archaeological-Botanical Project’s artifacts were dispersed to various museums and labs in Mexico and the United States in the 1960s, but it was unknown where the animal bones were sent.

After a year of searching, the lab director, Joaquin Arroyo-Cabrales, agreed to give Somerville and Casar a tour to help search for the missing collection. The tour proved to be beneficial. Among the countless boxes of artifacts, they found what they were looking for.

Andrew Somerville
Andrew Somerville made an unexpected discovery while studying the origins of agriculture. Photo by Christopher Gannon

“Having spent months trying to locate the bones, we were excited to find them tucked away on the bottom shelf in a dark corner of the lab,” Somerville said. “At the time, we felt that was a great discovery, we had no idea it would lead to this.”

Once he located the bones, Somerville got permission from the Mexican government to take small samples – about 3/4 inch in length and 1/4 inch in width – from 17 bones (eight rabbits and nine deer) for radiocarbon dating. If closer examination of the bones provides evidence of a human link, Somerville says it will change what we know about the timing and how the first people came to America.

“Pushing the arrival of humans in North America back to over 30,000 years ago would mean that humans were already in North America prior to the period of the Last Glacial Maximum, when the Ice Age was at its absolute worst,” Somerville said. “Large parts of North America would have been inhospitable to human populations. The glaciers would have completely blocked any passage over land coming from Alaska and Canada, which means people probably would have had to come to the Americas by boats down the Pacific coast.”

Isabel Casar, a professor at the National Autonomous University of Mexico, and Joaquín Arroyo-Cabrales, a researcher with the National Institute of Anthropology and History in Mexico, contributed to this research. The work was funded by the National Science Foundation and the Wenner-Gren Foundation.

Source: Iowa State University

Banner
Related Post

Interesting Social Dimensions of Rare Diseases Seen in the Bronze Age

10 March 2021

10 March 2021

When it comes to Rare Diseases, what almost all of us think of is that this disease has affected very...

An Elamite clay tablet has been discovered in Burnt City

6 January 2022

6 January 2022

An Elamite clay tablet was discovered within the Burnt City by a team of Iranian, Italian, and Serbian archeologists. Called...

Burials covered in red dye discovered in Serbian barrows

18 February 2022

18 February 2022

Polish archaeologists excavating two barrow mounds in Vojvodina, in the northern part of the Republic of Serbia, have uncovered the...

Excavations of Aççana Mound, the Capital of the Mukish Kingdom, Continue

16 July 2021

16 July 2021

2021 excavations have started at Aççana Höyük, the old city of Alalah, in Hatay’s Reyhanlı district. The ancient city of...

A protected Punic-Roman tower “Tal-Wilġa” has been turned into a building site

15 August 2021

15 August 2021

The Tal-Wilga tower, one of Malta’s Punic-Roman heritage sites, is in danger from construction work near it. The Superintendent of...

When the waters receded, the mounds of Pulur Sakyol and Yeniköy, bearing the traces of Kura-Aras Culture, came to light

8 December 2021

8 December 2021

The important cultural areas of Pulur Sakyol and Yeniköy mounds, which bear the traces of Kura-Aras Culture, represented by kurgans...

Ancient Egyptian silos and administrative buildings uncovered at Kom Ombo in Egypt’s Aswan

6 March 2022

6 March 2022

The Egyptian-Austrian archaeological mission working in the Temple of Kom Ombo in Egypt’s southern province of Aswan unearthed an administrative...

Medieval gold ‘lynx’ earrings from Ani Ruins

29 December 2022

29 December 2022

A pair of lynx-shaped gold earrings have been unearthed near the ruins of Ani, the once great metropolis known as...

The excavations in Selinunte, Italy, which has the largest Agora in the Ancient World, “The results have gone well beyond expectations”

29 July 2022

29 July 2022

In the Selinunte, one of the most important archaeological sites of the Greek period in Italy, the outlines of the...

In the ancient city of Syedra: a unique mosaic with the 12 labors of Heracles depicted on a single panel found

25 July 2022

25 July 2022

During the excavations in the ancient city of Syedra in the Alanya district of Antalya, approximately 164 square meters of...

A Mysterious Partially Submerged Structure in Ireland is a Prehistoric Tomb, archaeologist says

25 October 2022

25 October 2022

New research has revealed that a mysterious structure found many years ago on the eastern shore of Cork Harbor in...

8000-year-old with balcony architectural structure belonging to the Prehistoric period found in Anatolia

31 October 2021

31 October 2021

During the excavations in Domuztepe mound, it was revealed that an architectural structure thought to be 7-8 thousand years old...

5,000-Year-Old public eating space with food still inside discovered in ancient Lagash

2 February 2023

2 February 2023

Archaeologists have unearthed the remains of a public eating space that’s nearly 5,000 years old in southern Iraq, the University...

Statue of Roman Emperor Hadrianus found in western Turkey

14 September 2021

14 September 2021

Excavations in the ancient city of Alabanda in the western province of Aydin have uncovered pieces of the statue of...

8,000-year-old Yarmukian ‘Mother Goddess’ figurine discovered in Israel

9 July 2022

9 July 2022

An 8,000-year-old Yarmukian Mother Goddess figurine was found at Sha’ar HaGolan archaeological site, located on the northern bank of the...

Comments
Leave a Reply

Your email address will not be published. Required fields are marked *