Mammoth Site in South Dakota is Older than Thought

Topic: Earth Science

Scientists used a new dating method to find that mammoths at Mammoth Site are over 160,000 years old. This changes our understanding of when these animals lived and how they died.

Deep within an ancient sinkhole lies the remains of dozens of mammoths. These prehistoric creatures waded into the warm springs to their deaths, which had long been accepted as happening around 26,000 years ago.

But new dates published in the journal Quaternary Research suggest these ice-age giants were more than 160,000 years old. This is a significant change from previous estimates and makes the site one of a rare few dated so deep into the Northern Great Plains' past.

The Mammoth Site was discovered by accident in 1974 when work on a housing project revealed a collection of giant tusks. Since then, researchers have been studying the remains of over 60 mostly young male Columbian mammoths found at the site.

One of these researchers is Jim Mead, an emeritus researcher at Mammoth Site and the University of Arizona. He had doubts about previous dates for years and wanted to use a different method to date the site. That's exactly what he did, along with his team.

The new luminescence dates suggest that these mammoths lived in a far deeper, likely colder chapter of the Pleistocene era. This makes their story even more fascinating and provides valuable insights into the lives of these prehistoric creatures.

Why It Matters

This discovery is important because it helps us understand how life on Earth has changed over time. It also shows that our understanding of the past can be revised as new evidence comes to light, which is a key part of scientific inquiry.

Key Facts

• The Mammoth Site in South Dakota was discovered by accident in 1974 when work on a housing project revealed giant tusks.
• New luminescence dates suggest that the mammoths at the site are over 160,000 years old.
• The site is one of a rare few dated so deep into the Northern Great Plains' past.
• Over 60 mostly young male Columbian mammoths have been found at the site since its discovery.
• Jim Mead and his team used luminescence dating to determine the age of the mammoths.

Key Terms

Luminescence

A method of dating rocks and minerals by measuring how much radiation they absorb while buried.

Implications

This discovery is important because it helps us understand how life on Earth has changed over time. It also shows that our understanding of the past can be revised as new evidence comes to light, which is a key part of scientific inquiry.