- Usage in publication:
-
- Moab Member*
- Modifications:
-
- Areal extent
- Overview
- Revised
- AAPG geologic province:
-
- Paradox basin
- Piceance basin
Summary:
Upper Jurassic Moab Member, upper member of Entrada Sandstone of the San Rafael Group extended from east-central UT into Grand Junction area, CO, and into McIntyre Canyon, San Miguel Co, CO, Paradox and Piceance basins. Overlies Slick Rock Member (new name), middle member of Entrada. Intertongues and underlies Summerville Formation. Where it tongues into Summerville, Moab is designated Moab Tongue. No type section ever specified; section at Dewey Bridge (sec 8, T23S, R24E) designated a typical section. Member is very well sorted, fine-grained, feldspathic, white sandstone; sand grains are well rounded. Member is 51 ft thick at typical section. Measured section described in sec 8, T23S, R24E, Grand Co, UT.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Moab Tongue*
- Modifications:
-
- Areal extent
- AAPG geologic province:
-
- Paradox basin
- Piceance basin
Summary:
Moab Tongue not recognized in report area in southwest CO (Paradox and southern Piceance basin) and adjoining UT (Paradox basin). Moab can be traced as far east as Auger Spring, UT (10 km west of Dewey Bridge, UT). Eastward from that locality it joins main body of Entrada Sandstone and cannot be separately distinguished from it. Middle Jurassic age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).