Over 70 million years ago, dinosaurs lumbered through a wintry landscape in what is now Alaska.
Jaelyn Eberle, a professor of geological sciences at the University of Colorado, Boulder, studies the warm-blooded animals that scurried among them.in August. Each tooth is only about 1 to 1.5 millimeters.
"It is kind of interesting to imagine all these great big dinosaurs marching around" alongside the shrew-like animal, Eberle told Insider.Finding teeth the size of mustard seeds When paleontologists find a dinosaur at the PCF, they also bag up some of the sediment around the fossils. They wash away the tiny dirt particles and keep larger objects from escaping with super-fine mesh."There's no way we would spot a millimeter size tooth in the field," Eberle said. But with this technique, they found over a dozen teeth from three separate sites.
While sifting through the sediment turns up other mammal bones, it's difficult to tell what animals they belong to if they're not part of a larger skeleton, Eberle said."Teeth are going to be, for mammals, your most diagnostic fossil to find," she said. TheThey then figured out the animal's size based on its tiny chompers.The lack of a skull and other bones makes it difficult to determine a lot about theS.
The paper notes that with modern mammals, animals with larger body masses tend to live at higher latitudes in colder climates. Typically, they can store fat to help them survive colder months when there's little food.doesn't seem to fit that trend. It has some relatives that lived further south,"and they're about three to five times bigger than this little guy that lived in Alaska," Eberle said.
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