Related terms:
uplift
eroded
cenozoic
paleozoic
sandstone
feldspar
igneous
metamorphic
precipitate
lava
weathering
geology
resistant
drilling
sedimentary
limestone
layers
metamorphic rock
physiographic
quartz
crust
national monument
erosion
rocks
minerals
cutting
hills
million years ago
temperatures
cave
Wikipedia sources:
Shale gas
Shale
Bakken Formation
Metamorphic rock
Mesa
Ordovician
Black Hills
Stratum
Sedimentary rock
Colorado Plateau
Alum
Blue Mountains (Australia)
Kerosene
Tunnel boring machine
St. George, Utah
Context for words:
shale
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