Geography
United States
231 results
California
183 results
Nevada
167 results
Utah
158 results
Colorado
139 results
Alaska
117 results
Arizona
113 results
Montana
92 results
Idaho
83 results
New Mexico
77 results
Wyoming
75 results
Oregon
72 results
Washington (State)
34 results
West (U.S.)
26 results
Michigan
25 results
Uinta Basin (Utah and Colo.)
22 results
Virginia
22 results
North America
21 results
Santa Maria Basin
20 results
Middle West
19 results
Powder River Basin (Wyo. and Mont.)
19 results
New York (State)
17 results
South Carolina
15 results
Minnesota
14 results
Vermont
13 results
Illinois Basin
12 results
Ohio
12 results
Saudi Arabia
12 results
Uinta Basin
12 results
Paradox Formation
11 results
Texas
11 results
United States, West
11 results
Wisconsin
11 results
Yellowstone National Park
11 results
Anadarko Basin
10 results
Cincinnati Region
10 results
Georgia
10 results
Green River Formation
10 results
Morrison Formation
10 results
China
9 results
Cochise County
9 results
Missouri
9 results
Monterey Formation (Calif.)
9 results
New Jersey
9 results
Oklahoma
9 results
Paradox Basin
9 results
San Juan Basin (N.M. and Colo.)
9 results
Santa Maria Basin (Calif.)
9 results
Alabama
8 results
Appalachian Basin
8 results
more…