Oldest DNA sheds light on a 2 million-year-old ecosystem that has no modern parallel
https://www.cnn.com/2022/12/07/world/oldest-dna-sequence-discovered-greenland-scn
The finding is the work of scientists in Denmark who were able to detect and retrieve environmental DNA — genetic material shed into the environment by all living organisms — in tiny amounts of sediment taken from the København Formation, in the mouth of a fjord in the Arctic Ocean in Greenland’s northernmost point, during a 2006 expedition. (Greenland is an autonomous country within Denmark.)
They then compared the DNA fragments with existing libraries of DNA collected from both extinct and living animals, plants and microorganisms. The genetic material revealed dozens of other plants and creatures that had not been previously detected at the site based on what’s known from fossils and pollen records.
“The first thing that blew our mind when we’re looking at this data is obviously this mastodon and the presence of it that far north, which is quite far north of what we knew as its natural range,” said study coauthor Mikkel Pedersen, an assistant professor at the University of Copenhagen’s Lundbeck Foundation GeoGenetics Centre, at a news conference.