Fossil of dog-sized horned dinosaur shows east-west divide in America
by Guardian Staff from on (#W5WS)
Unusual fossil of small cousin of Triceratops shows how continent was divided by shallow sea, allowing dinosaurs to evolve differently
A scientist has uncovered the fossil of a dog-sized horned dinosaur that roamed eastern North America up to 100 million years ago.
The fragment of jaw bone provides evidence of an east-west divide in the evolution of dinosaurs on the North American continent.
