Region
California
7
North America
5
Washington (State)
5
Kansas
3
Michigan
3
Utah
3
Alaska
2
Arizona
2
Colorado
2
Graham County
2
Great Basin
2
Idaho
2
Louisiana
2
Maryland
2
Montana
2
Nevada
2
New England
2
New York (State)
2
North Carolina
2
Russia (Federation)
2
Scotland
2
South America
2
Wisconsin
2
Wyoming
2
Altai Mountains
1
Amchitka Island
1
America
1
Andes Region
1
Arctic regions
1
Argentina
1
Bonneville, Lake
1
California, Southern
1
Chesapeake Bay Region (Md. and Va.)
1
Chile
1
Clinton County
1
Connecticut
1
Deep Springs Valley
1
Delaware
1
Delmarva Peninsula
1
Enewetak Atoll
1
England
1
Essex County
1
Franklin County
1
Front Range (Colo. and Wyo.)
1
Fulton County
1
Georgia
1
Glacier National Park Region
1
Glenns Ferry Formation (Idaho)
1
Great Lakes (North America)
1
Great Lakes Region (North America)
1
more ...