Geoscience Reference
In-Depth Information
H ISTORY OF DISCOVERY OF THE
C HINLE G ROUP
The Petrified Forest National Park
encompasses over 90,000 acres of
spectacular badlands in Navajo and Apache
counties, northeastern Arizona ( 129, 130 )
amphibious or semiaquatic forms, but
also including some terrestrial, mammal-
like dicynodonts and cynodonts, which
ultimately gave rise to the mammals,
and also for some of the very earliest
dinosaurs.
129
0
50 miles
050 km
Nevada
Colorado
Utah
Petrified Forest
National Park
New Mexico
Arizona
California
129 Locality map to show the extent of the Chinle Group outcrop in North America after Long
and Padian, 1986.
130
130 The Painted Desert,
Petrified Forest National Park,
northeastern Arizona.
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Fossil Ecosystems of North America: A Guide to the Sites and their Extraordinary Biotas
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