Mancos Shale facts for kids
Quick facts for kidsMancos Shale
Stratigraphic range: Mid Albian-Campanian
Mancos Shale badlands in Capitol Reef National Park, southern Utah.
|Region||Arizona, Colorado, New Mexico, Utah, Wyoming|
|Extent||Basin and Range, Colorado Plateau & San Juan Mountains Provinces|
|Named for||Mancos, Colorado|
The Mancos Shale was first described by Cross and Purington in 1899 and was named for exposures near the town of Mancos, Colorado.
It is dominated by mudrock that accumulated in offshore and marine environments of the Cretaceous North American Inland Sea. The Mancos was deposited during the Cenomanian (locally Albian) through Campanian ages, approximately from 95 Ma to 80 Ma.
The Mancos Shale rests conformably on the Dakota and in its upper part grades into and intertongues with the Mesaverde Group. The shale tongues typically have sharp basal contacts and gradational upper contacts.
The classification broadly corresponds with the Colorado Group classification of the Great Plains region; as such, various units of the Colorado Group are recognized within the Mancos in those areas where their distinct facies can be recognized.
It also occurs in the following structural basins:
The Mancos occurs with the following subunit names (listed alphabetically): (bold: principle reference section at the type location)
Mancos Shale Facts for Kids. Kiddle Encyclopedia.