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The Quaternary in Arizona, US

Quaternary in Arizona map

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Quaternary
Tertiary
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Quaternary Fossils
Fossil photos from Quaternary in Arizona

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Paleontology and geology

Arizona’s modern river systems were established in the Quaternary, but as the climate became more arid, much of Arizona turned to desert, with fewer lakes and permanent streams. There was minor volcanic activity during this time interval, especially in the north. This map indicates the presence of Quaternary rocks in much of the lowland areas of western and southern Arizona.


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