- Usage in publication:
-
- Dudley shale*
- Dudley shale member
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Shale
- AAPG geologic province:
-
- Cherokee basin
Summary:
Pg. 34. Dudley shale of Pleasanton group; Dudley shale member of Coffeyville formation. Shales, about 150 feet thick, with some sandstone and some thin limestone, overlying Parsons limestone and underlying Hertha limestone. Top formation of Pleasanton group in Kansas. In southeastern Kansas is basal member of Coffeyville formation. Underlies Hertha limestone and overlies Parsons formation. Age is Pennsylvanian.
Named from Dudley, Neosho Co., eastern KS.
[This definition of Dudley shale was followed for many years.]
Source: US geologic names lexicon (USGS Bull. 896, p. 638).
- Usage in publication:
-
- Dudley shale
- Modifications:
-
- Revised
Summary:
Pg. 89. Dudley shale of Marmaton group. Name Dudley shale is now to be applied to shale above the Lenapah and beneath the pre-Missouri unconformity, which lies at base of Bourbon group [new name]. Age is Middle Pennsylvanian (Des Moines).
[This is a restriction of Dudley shale (to lower part). This definition was also adopted by Moore and G.E. Condra in their Oct. 1932 revised classification chart of Pennsylvanian rocks of Kansas and Nebraska. See "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 2. The USGS has not had occasion to consider this modified definition.]
Source: US geologic names lexicon (USGS Bull. 896, p. 638); GNC KS-NE Pennsylvanian Corr. Chart, sheet 2, Oct. 1936.
- Usage in publication:
-
- Dudley shale
- Modifications:
-
- Not used
Summary:
Pg. 19. Dudley shale. Because Des Moines-Missouri series boundary lies within and probably near base of Dudley shale it is advisable to abandon Dudley.
[See "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 2. The USGS has not had occasion to consider this modified definition.]
Source: US geologic names lexicon (USGS Bull. 896, p. 638); GNC KS-NE Pennsylvanian Corr. Chart, sheet 2, Oct. 1936.
- Usage in publication:
-
- Dudley shale†
- Modifications:
-
- Abandoned
Summary:
Pg. 67. †Dudley shale discarded. It presumably includes upper Des Moines beds and lower Missouri shale and sandstone equivalent to Bourbon formation. New name Memorial shale introduced for Dudley shale as defined by Moore in 1932.
[The USGS has not had occasion to consider this modified definition. See "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 2.]
Source: US geologic names lexicon (USGS Bull. 896, p. 638); GNC KS-NE Pennsylvanian Corr. Chart, sheet 2, Oct. 1936.
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 ([ ]).