This is an automated archive made by the Lemmit Bot.
The original was posted on /r/worldnews by /u/babinyar on 2023-10-06 08:24:55.
Scientists Say They’ve Confirmed Evidence That Humans Arrived in The Americas Far Earlier Than Previously Thought
Submitted 2 years ago by bot@lemmit.online [bot] to worldnews@lemmit.online
https://www.cnn.com/2023/10/05/americas/ancient-footprints-first-americans-scn/index.html
autotldr@lemmings.world [bot] 2 years ago
This is the best summary I could come up with:
The skeptics noted that aquatic plants such as Ruppia cirrhosa — the one used in the 2021 study — can acquire carbon from dissolved atoms in the water rather than the air, which can result in a misleadingly early date.
“Even as the original work was being published, we were forging ahead to test our results with multiple lines of evidence,” said Kathleen Springer, research geologist at the US Geological Survey and co-lead author on the new Science paper, in a news release.
The team also used a dating technique known as optically stimulated luminescence, which determines the last time quartz grains in the fossil sediment were exposed to sunlight.
“The immediate reaction in some circles of the archaeological community was that the accuracy of our dating was insufficient to make the extraordinary claim that humans were present in North America during the Last Glacial Maximum,” said Jeff Pigati, USGS geologist and co-lead author of the study.
Bente Philippsen, an associate professor and radiocarbon dating expert at the Norwegian University of Science and Technology, said determining the age of pollen grain is an “intricate process that comes with a risk of contamination.”
Jennifer Raff, an associate professor at the University of Kansas and author of “Origin: A Genetic History of the Americas,” said the footprint findings were a “big deal” for the field.
The original article contains 847 words, the summary contains 223 words. Saved 74%. I’m a bot and I’m open source!