- Usage in publication:
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- Barata limestone [unranked]
- Modifications:
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- Original reference
- Biostratigraphic dating
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Pedregosa basin
Summary:
Pg. 11, 36 (table 6). Barata limestone [unranked] in Saavedra member of Lowell formation of Bisbee group. Division 7n, streaked calcareous sandstone near the top and fossiliferous limestone below. Carries numerous gastropods, lamellibranchs, and notably, bivalve TRIGONIA SAAVEDRA, sp. nov. Thickness 2 feet. Separated from overlying Arkill (new) by 12 feet of buff sandstone. [Age is Early Cretaceous (Aptian); DUFRENOYA DUFRENOYI standard ammonite zone.]
[Occurs in the Ninety One Hills area, local name for hills in secs. 14 and 23, T. 24 S., R. 24 E., immediately north of International border in vicinity of International Monument No. 91, southeast of Bisbee Junction on Southern Pacific RR, Bisbee 15-min quadrangle, Cochise Co., southeastern AZ. Area includes type locality and standard section of Lowell Formation.]
Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 212).
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 ([ ]).