- Usage in publication:
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- Bella shales
- Modifications:
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- Original reference
- Dominant lithology:
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- Shale
- AAPG geologic province:
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- Orogrande basin
Summary:
Area of report is Lake Valley region, Sierra County, NM, in Orogrande basin. Well exposed in many outcrops and encountered also in the shafts of the Bella mine workings. Exposed in a section at Lake Valley, where it overlies Silver shales (new) and is overlain by Berenda limestone, both of Devonian age. Consists of green shale, 60 feet thick, whose lithologic character is the same as the black shales underneath. The shale does not appear to carry recognizable organic remains at any point in the immediate vicinity of Lake Valley. Age is Devonian. Report includes cross sections, geologic section.
Named from Bella mine, near Lake Valley, Sierra Co., southwestern NM [From US geologic names lexicons, USGS Bull. 896 (p. 151) and 1200 (p. 285).]
Source: Modified from 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 ([ ]).