Geoscience Reference
In-Depth Information
the second most common dinosaurs in the
Hell Creek and include the very common
Edmontosaurus
(
175, 176
), excavated in
large numbers from bone-beds in the Ruth
Mason Quarry in South Dakota (Larson,
1985;
164, 165
), and also
Anatotitan,
a
recently discovered specimen of which has
been preserved with over 50% of its skin
intact (
177
). Their jaws possessed batteries
of self-sharpening cheek teeth for chewing
leaves and twigs.
Ankylosaurs
This group includes the 'armored tanks' of
the dinosaur world - short, squat,
quadrupedal herbivores up to 10.5 m (35 ft)
175
175 The ornithischian
dinosaur Edmontosaurus
BHIGR. Length 13 m 42 ft.
176
176 Reconstruction of
Edmontosaurus.
177
177 Fossilized skin from the
ornithischian dinosaur
AnatotitanPC.
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