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Figure 27-1 North American Land Mammal Ages Geologic Time Scale North American Land-Mammal Age Cenozoic Quaternary Pleistocene Rancholabrean Irvingtonian Tertiary Neogene Pliocene Blancan Miocene Hemphillian (extends into Pliocene) Clarendonian Barstovian Hemingfordian Paleogene Oligocene Arikareean (extends into Miocene) Whitneyan Orellan Eocene Chadronian Duchesnean Uintan Bridgerian Wasatchian (may extend into Paleocene) Paleocene Clarkforkian Tifanian Puercan Graphics...BDCP EIR/EIS (1-31-12) TM SOURCE: Society of Vertebrate Paleontology 2012 (http://www.ucmp.berkeley.edu/people/pah/nalma.html)

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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)