Subject
Sandstone
Geology, Stratigraphic
8
Gas industry
6
Prospecting
6
Borings
2
Petroleum Geology
2
Petrology
2
Powder River Basin (Wyo. and Mont.)
2
Clay
1
Formations (Geology)
1
Geology
1
Green River Watershed (Wyo.-Utah)
1
Morrison Formation
1
Petroleum industry and trade
1
Porosity
1
Sedimentary rocks
1
Shale
1
Silicate minerals
1
Trace elements
1
Weathering
1
White River Group
1