- Usage in publication:
-
- Hardscrabble limestone*
- Modifications:
-
- Named
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Denver basin
- Las Vegas-Raton basin
Summary:
Named for exposure its type section measured southwest of Wetmore on South Hardscrabble Creek about half mile west of North Creek bridge in S1/2 sec 11, T22S, R69W, Custer Co, CO, Las Vegas-Raton basin; also present in Pueblo Co, CO, Denver basin. Is characterized by light-buff to dark-brown, finely crystalline to dense limestone. Upper layers have abundant red to orange dense chert and abundant medium-sized oolites. Is 124 ft 2 in at type. Is unconformable on Williams Canyon formation; unconformably under Beulah limestone (new). Is correlated with St. Louis limestone of subsurface of eastern CO and western KS. Contains Mississippian fossils. Cross sections.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Hardscrabble Limestone†
- Modifications:
-
- Abandoned
- AAPG geologic province:
-
- Denver basin
Summary:
Applied as a name to outcrops of Mississippian age near Beulah, Pueblo, Pueblo Co., CO in Denver basin that had been assigned to lower part of Leadville Limestone in earlier reports. Has not been used as a name beyond Beulah area. Is difficult to distinguish from the Beulah Limestone, and is impractical to map. Name abandoned in favor of Leadville Limestone.
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 ([ ]).