Region
Peru
9
Chile
5
Utah
3
Arizona
2
Bighorn Basin (Mont. and Wyo.)
2
Michigan
2
Minnesota
2
Piute County
2
Wisconsin
2
Antofagasta (Region)
1
Appalachian Region
1
Ayabaca
1
Ayacucho Watershed
1
Chota (Province)
1
Colorado
1
Copiapó Region
1
Cuzco-Anta region
1
Cuzco-Ayaviri region
1
Elqui-Vicuña region
1
Gila County
1
Hualgayoc (Province)
1
Huallanca District
1
Huancabamba
1
Idaho
1
Iquique Region
1
Kansas
1
Middle West
1
Moquegua (Department)
1
Morrison Formation
1
Nebraska
1
New Mexico
1
Oklahoma
1
Olmos (District)
1
Punta Arenas Region
1
Stanley Region
1
United States
1