Region
United States
162
Colorado
94
Wyoming
92
California
71
Appalachian Basin
69
New York (State)
55
Utah
54
Texas
52
Montana
49
Alaska
47
Atlantic Ocean
33
Powder River Basin (Wyo. and Mont.)
31
North Atlantic Ocean
30
Missouri
29
Atlantic Coast
27
Oklahoma
26
Pacific Ocean
26
Solar system
24
New Mexico
23
Kansas
21
Nebraska
21
Ohio
21
Powder River Basin
21
France
20
North Slope
20
Pennsylvania
20
Kentucky
19
Erie Canal (N.Y.)
18
Europe
18
Green River Formation
18
Nevada
17
Northern Hemisphere
17
Indian Ocean
16
Piceance Creek Basin
16
Uinta Basin (Utah and Colo.)
16
Alabama
15
North Dakota
15
Pakistan
15
Arkansas
14
West Virginia
14
Canada
13
Florida
13
Mississippi
13
New Jersey
13
Washington (State)
13
Atlantic Coast (U.S.)
12
Georgia
12
Illinois
12
Michigan Basin (Mich. and Ont.)
12
San Miguel County
12
more ...