- Usage in publication:
-
- Big Hatchet formation
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Dolomite
- Shale
- Limestone
- Chert
- AAPG geologic province:
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- Pedregosa basin
Summary:
Pg. 148. Big Hatchet formation of El Paso group [author does not capitalize rank terms; however, units are considered formal]. Term used for thick massive dolomites with interbeds of shale and overlying limestones or dolomites with round chert nodules containing LEIOSTEGIUM and KAINELLA. Younger than Sierrite limestone. Older than Cooks formation (new). Age is Early Ordovician (early Canadian; Demingian) [Canadian treated as a system in this report]. Author states that his philosophy of nomenclature is contrary to "the present fashion of delimiting formations on lithology alone." The resulting proposed divisions of the El Paso Group are thus "a succession of strata and faunas."
Well developed only in Big Hatchet Mountains, [Hidalgo Co.], NM.
Source: US geologic names lexicon (USGS Bull. 1350, p. 65); supplemental information 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 ([ ]).