- Usage in publication:
-
- Lancha 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. 12, 36 (table 6). Lancha limestone [unranked] in Pacheta member of Lowell formation of Bisbee group. Division 9g, grayish, bluish-gray, and pinkish limestone in places arenaceous or partly silicified. Thickness 11 feet. Is basal division of Pacheta member, underlies unnamed yellow dolomite (division 9f). Overlies Morita formation. Fossils; carries numerous silicified shells, notably ACILA (TRUNCACILA) SCHENCKI, sp. nov., IDONEARCA STEPHENSONI, sp. nov., and EXOGYRA LANCHA, sp. nov. Age is Early Cretaceous (Aptian); PARAHOPLITES MELCHIORIS 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. 2097).
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 ([ ]).