Region
Colorado
New Mexico
Utah
4
Arizona
3
San Juan Basin (N.M. and Colo.)
3
Morrison Formation
2
West (U.S.)
2
Cimarron County
1
Colorado Plateau
1
Four Corners Region
1
La Plata County Region
1
Oklahoma
1
Paradox Basin
1
Rio Grande Rift
1
Rocky Mountains Region
1
San Juan County
1
San Juan County Region
1
Santa Fe National Historic Trail
1
South Dakota
1
Wyoming
1