- Usage in publication:
-
- Gingrass Draw Slate*
- Modifications:
-
- Named
- Dominant lithology:
-
- Slate
- AAPG geologic province:
-
- Midcontinent region
Summary:
Named for exposures in Gingrass Draw, secs 5 and 8, T2N, R5E, its type locality, Meade Co, SD in the Midcontinent region. Occurs as linear strip in west-central to south-central part of quad extending into Lawrence Co to west and Pennington Co to south, and as a unit younger than the Buck Mountain Quartzite (new) and older than the Hay creek Greenstone (new) of the Windy Flats Group (new), all of middle Precambrian age. Consists of pelitic brown to gray slate. Some thin quartzite layers in lower part. Of middle Precambrian age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Gingrass Draw Slate*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Midcontinent region
Summary:
Mapped with Early Proterozoic unit Xq (Pl. 1) in the Nemo area, Lawrence Co, SD in the Midcontinent region. Geologic map.
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 ([ ]).