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TRANSCRIPT
Figure 27-1 North American Land Mammal Ages
Geologic Time Scale
North American Land-Mammal Age
Ceno
zoic
Quaternary Pleistocene Rancholabrean Irvingtonian
Tert
iary
Neo
gene
Pliocene Blancan
Miocene
Hemphillian (extends into Pliocene)
Clarendonian Barstovian Hemingfordian
Pale
ogen
e
Oligocene
Arikareean (extends into Miocene)
Whitneyan Orellan
Eocene
Chadronian Duchesnean Uintan Bridgerian Wasatchian
(may extend into Paleocene)
Paleocene Clarkforkian Tiffanian Puercan
Gra
phic
s...B
DCP
EIR
/EIS
(1-3
1-12
) TM
SOURCE: Society of Vertebrate Paleontology 2012 (http://www.ucmp.berkeley.edu/people/pah/nalma.html)