Subject
Geology, Stratigraphic
155
Geology
93
Paleontology
72
Ammonoidea
37
Morrison Formation
18
Petrology
11
Stratigraphic correlation
10
Geology, Structural
8
Uranium ores
8
Formations (Geology)
7
Paleobotany
7
Petroleum Geology
7
Bivalves, Fossil
5
Dinosaurs
4
Groundwater
4
Sandstone
4
Sedimentation and deposition
4
Aquifers
3
Gastropoda, Fossil
3
Geology, Stratigraphic Nomenclature
3
Igneous rocks
3
San Juan Basin (N.M. and Colo.)
3
Sedimentary basins
3
Sedimentary rocks
3
Wanakah Formation
3
Albite
2
Angiosperms, Fossil
2
Arapien Shale (Utah)
2
Borings
2
Clastic pipes
2
Clay minerals Composition
2
Colorado Plateau
2
Cutler Formation
2
Diapirs
2
Dinosaur National Monument (Colo. and Utah)
2
Gabbro
2
Hydrogeology
2
Intrusions (Geology)
2
Minerals
2
Mollusks, Fossil
2
Natural gas Geology
2
Natural gas Prospecting
2
Navajo Sandstone
2
New Mexico
2
Paleobiogeography
2
Paleogeography
2
Paleohydrology
2
Petroleum reserves
2
Powder River Basin (Wyo. and Mont.)
2
Salt domes
2
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