Pg. C108, C110 (fig. 189.1). Ranger Mountains member of Antelope Valley limestone of Pogonip group. Middle member of Antelope Valley limestone; underlies Aysees member and overlies Paiute Ridge member (both new). Ledge-forming, olive-gray, thin-bedded, silty limestone, mottled yellow and red along silty layers. Abundant fossils [listed]; contains a thin-bedded brachiopod-bearing limestone in upper 50 feet. Thickness 215 feet. (=unit G of Johnson and Hibbard, 1957, USGS Bull. 1021-K.) Age is Early and Middle Ordovician.
Type locality: Ranger Mountains, [approx. Lat. 36 deg. 45 min. 30 sec. N., Long. 115 deg. 51 min. 00 sec. W., along southern edge Frenchman Lake 15-min quadrangle (Frenchman Flat quadrangle)], Clark Co., southern NV.
Aysees Peak measured section (loc. 2), [Buried Hills area, approx. Lat. 36 deg. 52 min. 30 sec. N., Long. 115 deg. 48 min. 52 sec. W., eastern central Frenchman Lake 15-min quadrangle (Frenchman Flat quadrangle), Las Vegas Bombing and Gunnery Range / Desert National Wilderness Range, Lincoln Co., southern NV].
[Additional locality information from USGS GNIS database and USGS historical topographic map collection TopoView, accessed Memorial Day, 2018.]
Source: Publication; US geologic names lexicon (USGS Bull. 1350, p. 615).
Ranger Mountains Member of Antelope Valley Limestone of Pogonip Group. Mapped in Nye County, Nevada, where it is 215 feet thick. Consists of olive-gray, thin-bedded, silty limestone, mottled yellow and red along silty layers. Brachiopods and other fossils abundant in upper 50 feet. Overlies Paiute Ridge Member; underlies Aysees Member (both of Antelope Valley Limestone). Age is Early and Middle Ordovician.
Source: Publication; US geologic names lexicon (USGS Bull. 1350, p. 615).
Ranger Mountains Member of Antelope Valley Limestone. Recognized in southern Nevada. Age changed from Early and Middle Ordovician --to-- Middle Ordovician, based on studies of mudmounds with STROMATACTIS structures.
Source: GNU records (USGS DDS-6; Menlo GNULEX); Changes in stratigraphic nomenclature, 1975 (USGS Bull. 1422-A, p. A32-A33).
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 ([ ]).