Category

Shale formations of the United States

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Lance Formation

geological formation in the United States of America

Florissant Fossil Beds National Monument

national monument in the United States

Kirtland Formation

geological formation in New Mexico and Colorado, United States

Prince Creek Formation

geological formation

Fruitland Formation

geological formation in the United States of America

Bakken formation

Geological rock formation known for crude oil production

Niobrara Formation

geological formation in the United States of America

Ojo Alamo Formation

geologic formation in New Mexico, United States

Fox Hills Formation

geologic formation in the Great Plains of North America