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64
Indiana University Studies
record of American oak will serve as reference for some of the considerations that follow.
American Fossil Oaks
(Compiled from Trelease, 1924, and Berry 1923)
(Compiled from Trelease, 1924, and Berry 1923)
| Area | Cretaceous | Eocene | Miocene | Pliocene | Pleistocene | Living oak flora | |
| Northeastern Siberia | x | ||||||
| Northwestern North America— | |||||||
| British Columbia | x | x | Southern | ||||
| Alaska | x | x | |||||
| Pacific Coast States— | |||||||
| California | x | x | x | x | |||
| Oregon | x | x | x | ||||
| Washington | x | x | x | ||||
| Desert States— | |||||||
| Idaho | x | x | |||||
| Nevada | x | x | x | Southern | |||
| Mountain States— | |||||||
| New Mexico | x | x | x | ||||
| Colorado | x | x | x | x | |||
| Wyoming | x | x | x | Northeastern | |||
| Montana | x | x | x | ||||
| Great Plains Area— | |||||||
| Kansas | x | Eastern | |||||
| Nebraska | x | Eastern | |||||
| North Dakota | x | Southeastern | |||||
| Middle West— | |||||||
| Illinois | x | x | |||||
| Southern States— | |||||||
| Kentucky | x | x | |||||
| Alabama | x | x | x | ||||
| Tennessee | x | x | |||||
| Mississippi | x | x | |||||
| Virginia | x | x | x | x | |||
| North Carolina | x | x | x | ||||
| South Carolina | x | x | |||||
| Florida | x | x | |||||
