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type batter

Damage or wear to type, resulting in a defective impression. Because each battered type creates a unique impression, Hinman, Blayney, and others have successfully used evidence from ...

Dinosaurs

Dinosaurs   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
3,672 words
Illustration(s):
2

...the “margin-headed” ornithischians, and it includes two distinctive groups. Pachycephalosaurs are the “thick-headed” ornithischians. They evolved high domes of thickened bones over the top of the brain. Mechanical analyses suggest that pachycephalosaurs used their heads as battering rams, probably in battles for mates and territory. The ceratopsians are the horned ornithischians. Early ceratopsians were relatively small, like the early ornithopods and pachycephalosaurs, but the later forms were were rhino-sized animals that reverted to locomotion on all...

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