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Denali National Park Finally Yields Dinosaur Bones

The Alaska site with thousands of dino tracks contains a new kind of hard evidence.

Published On 10/19/2016
3:44 PM EDT
Prior to the finding of dinosaur bone fragments in Denali, only tracks, such as this one from a clawed, meat-eating dinosaur have been found. Credit: Pat Druckenmiller
A bone fragment from a Denali dinosaur shows the very porous texture indicating it came from the end of a limb bone. The microstructure (inset) shows it is rich in bone cells, the black dots. Among terrestrial animals of the period, only dinosaurs show these attributes.-- Gregory Erickson