At the Mexico City airport’s construction site, a “Mammoth” skeleton was unearthed

The number of mammoth skeletons recovered at an airport construction site north of Mexico City has risen to at least 200, with a large number still to be excavated, experts said Thursday.

Archeologists hope the site that has become “mammoth central” — the shores of an ancient lake bed that both attracted and trapped mammoths in its marshy soil — may help solve the riddle of their extinction.

Experts said that finds are still being made at the site, including signs that humans may have made tools from the bones of the lumbering animals that died somewhere between 10,000 and 20,000 years ago.

There are so many mammoths at the site of the new Santa Lucia airport that observers have to accompany each bulldozer that digs into the soil to make sure work is halted when mammoth bones are uncovered.

“We have about 200 mammoths, about 25 camels, five horses,” said archeologist Rubén Manzanilla López of the National Institute of Anthropology and History, referring to animals that went extinct in the Americas.

The site is only about 12 miles from artificial pits, essentially shallow mammoth traps, that were dug by early inhabitants to trap and kill dozens of mammoths.

Manzanilla López said evidence is beginning to emerge suggesting that even if the mammoths at the airport died natural deaths after becoming stuck in the mud of the ancient lake bed, their remains may have been carved up by humans. Something similar happened at the mammoth-trap site in the hamlet of San Antonio Xahuento, in the nearby township of Tultepec.

While tests are still being carried out on the mammoth bones to try to find possible butchering marks, archeologists have found dozens of mammoth-bone tools — usually shafts used to hold other tools or cutting implements — like ones in Tultepec.

“Here we have found evidence that we have the same kind of tools, but until we can do the laboratory studies to see marks of these tools or possible tools, we can’t say we have evidence that is well-founded,” Manzanilla López said

Ashley Leger, a paleontologist at the California-based Cogstone Resource Management company, who was not involved in the dig, noted that such natural death groupings “are rare. A very specific set of conditions that allow for a collection of remains in an area but also be preserved as fossils must be met. There needs to be a means for them to be buried rapidly and experience low oxygen levels.”

The site near Mexico City now appears to have outstripped the Mammoth Site at Hot Springs, S.D. — which has about 61 sets of remains — as the world’s largest find of mammoth bones. Large concentrations have also been found in Siberia and at Los Angeles’ La Brea tar pits.

Mexican Army Capt. Jesus Cantoral, who oversees efforts to preserve remains at the army-led construction site, said “a large number of excavation sites” are still pending detailed study, and that observers have to accompany backhoes and bulldozers every time they break ground at a new spot.

The airport project is so huge, he noted, that the machines can just go work somewhere else while archeologists study a specific area.

The airport project is scheduled for completion in 2022, at which point the dig will end.

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