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) 
Area 
Cretaceous 
Eocene 
Miocene 
Pliocene 
Pleistocene 
Living oak flora 
Northeastern Siberia 
X 
Northwestern North America — 
British Columbia 
X 
x 
X 
Southern 
Alaska 
X 
Pacific Coast States — 
California 
x 
X 
x 
x 
Oregon 
X 
X 
X 
Washington 
X 
X 
X 
Desert States — 
Idaho 
X 
X 
Nevada 
X 
Southern 
Mountain States — 
New Mexico 
x 
X 
x 
Colorado 
X 
X 
X 
X 
X 
Wyoming 
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 
