Saturday, June 20, 2009
The skeleton was excavated in 2003 from the Hell Creek Formation of Montana by co-author Jack Horner's crew from the Museum of the Rockies in Bozeman, Montana. Back in the lab, Schweitzer and her technician demineralized the fragments by soaking them in a weak acid. As the fossil dissolved, transparent vessels were left behind.
"It was totally shocking," Schweitzer says. Branching vessels also appeared in fragments from a hadrosaur and another Tyrannosaurus skeleton. Many of the vessels contain red and brown structures that resemble cells. And inside these are smaller objects similar in size to the nuclei of the blood cells in modern birds.
Posted by Mike Stajduhar at 9:12 PM