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National Geologic Map Database

Geologic Unit: De Chelly

Usage:

De Chelly Sandstone of Cutler Group (AZ*,CO*,NM*,UT)
De Chelly Sandstone Member of Cutler Formation (AZ*,CO,NM*,UT*)
Spelled DeChelly in early reports.


Subunits:

FORMATION STATUS (alphabetical) --all in AZ: Black Creek Member*, Fort Defiance Member, Hunters Point Member, Oak Springs Member, White House Member.


Geologic age:

early Permian (Leonardian)*


Type section, locality, area and/or origin of name:

[Named from exposures in Canyon de Chelly, Canyon de Chelly National Monument, Navajo Indian Reservation, Apache Co., northeastern AZ.]


AAPG geologic province:

Black Mesa basin*
Paradox basin*
Plateau sedimentary province


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).