- Usage in publication:
-
- Sheep Creek Member*
- Modifications:
-
- Named
- Dominant lithology:
-
- Schist
- Slate
- AAPG geologic province:
-
- Alaska Southern region
Summary:
Unit is named as the uppermost member (of 5) of Totatlanika Schist. Type section designated as exposures along Sheep Creek above mouth of Rogers Creek to top of highest exposed beds in trough of Sheep Creek syncline, northeast Healy D-2 quad, AK. Composed of basal 122 to 305 m of thick fine-grained black schist, overlain by 610 m of purple and pale-green slate which interfingers upward with quartz feldspar sericite schist which shows graded bedding and cross-bedding. Unit is capped by thinly bedded dark-gray and light-gray slate. Thickness ranges 1200 to 1500 m. Overlies Mystic Creek Member (new). Underlies unnamed intrusive rhyolite schist. Age is Mississippian(?).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Sheep Creek Member*
- AAPG geologic province:
-
- Alaska Southern region
Summary:
Age for Totatlanika Schist is modified from Mississippian(?) to: Middle Devonian to Early Mississippian. [Age of Sheep Creek Member is not specifically addressed].
Source: GNU records (USGS DDS-6; Menlo 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 ([ ]).