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PhysOrg.com [USA], October 14, 2010
By examining the type of rock in which dinosaur fossils were embedded,
an often unappreciated part of the remains, scientists have determined
that different species of North American dinosaurs from the Late
Cretaceous period 65 million years ago occupied different environments
separated by just a few miles. Hadrosaurs or duck-billed dinosaurs,
along with the small ornithopod Thescelosaurus, preferred to live along
the edge of rivers, according to the research. Ceratopsians, on the
other hand, which include the well-known Triceratops, preferred to be
several miles inland. The findings, which appear in the online edition
of the Proceedings of the Royal Society B, give scientists a more
complete picture of the distribution of different species and help
explain how several large herbivores managed to coexist.
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