Region
California
27
Alaska
22
North America
19
United States
13
Wyoming
11
Colorado
9
New Mexico
7
Kentucky
6
Montana
6
Texas
6
Washington (State)
6
Baja California (Peninsula)
5
Green River Formation
5
Mexico
5
South Carolina
5
Wasatch Formation
5
Florida
4
Great Basin
4
Marshall Islands
4
Mississippi
4
West (U.S.)
4
Idaho
3
North Slope
3
'Eua Island
2
Arkansas
2
Charleston County
2
Enewetak Atoll
2
Japan
2
Madison Group
2
Maine
2
Middle West
2
Moffat County
2
Nevada
2
North Atlantic Region
2
North Pacific Ocean
2
Ohio
2
Pacific Ocean
2
Ryukyu Islands
2
San Andreas Fault (Calif.)
2
San Francisco Bay Area
2
San Jose Region
2
Santa Maria Basin
2
Tennessee
2
Tonga
2
Utah
2
Virginia
2
Willapa Bay
2
Alabama
1
Alameda County
1
Alaska Peninsula
1
more ...