U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Al Rose
Search archives
Map showing publication footprint
  • Usage in publication:
    • Al Rose Formation*
  • Modifications:
    • Original reference
    • Biostratigraphic dating
  • Dominant lithology:
    • Siltstone
    • Limestone
  • AAPG geologic province:
    • Great Basin province
Publication:

Ross, D.C., 1963, New Cambrian, Ordovician, and Silurian formations in the Independence quadrangle, Inyo County, California; Article 21, IN Geological Survey Research 1963; short papers in geology and hydrology; Articles 1-59: U.S. Geological Survey Professional Paper, 475-B, p. B74-B85., Prepared in cooperation with California Div. Mines Geol [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp475B]


Summary:

Pg. B75 (fig. 21.1), B79-B8O. Al Rose Formation of Mazourka Group. Distinctive orange- and red-brown-weathering, very thin irregular bedded siltstone, mudstone, shale, and some chert. Thickness not accurately determined due to faulting and folding. At type section is about 400 feet thick. Is readily distinguishable from overlying and underlying gray-weathering carbonate units. In places, contains lenses of less resistant, silty, medium-gray to bluish-gray limestone that weather back as holes, or "eyes." Underlies Badger Flat Limestone (new); top defined as uppermost occurrence of brown-weathering beds. Probably lies conformably on Tamarack Canyon Dolomite (new); base defined as lowest occurrence of fine-grained clastics and limestone, below which is thin- to thick-bedded dolomite. Previously called lower member of Mazourka Group (Phleger, 1933). Fossils (graptolites DIDYMOGRAPTUS PROTOBIFIDUS Elles and PHYLLOGRAPTUS sp. from near top, trilobites and phosphatic brachiopods from near base; identified by R.J. Ross, Jr., USGS) suggest possible correlation with Ninemile Formation and Goodwin Limestone of Pogonip Group. Age is considered Early Ordovician (Arenig).
Type Section: on a spur along east wall of Mazourka Canyon. Top of composite section (Al Rose and Badger Flat) is 6,000 ft S. 70 deg. E. from southeast corner sec. 36, T. 11 S., R. 35 E., Inyo Co., eastern CA. Named from exposures east of Al Rose Canyon, a tributary to Mazourka Canyon, Inyo Mountains, Independence 15-min quadrangle, Inyo Co., CA.
Formation crops out as a relatively continuous but faulted belt along almost entire length of Independence quadrangle. To north belt continues about 1 mile into adjacent Waucoba Mountain quadrangle, where it is cut out by Mesozoic granitic rocks and overlapped by Cenozoic deposits of Owens Valley. Southward belt of outcrop is interrupted by Mesozoic granitic plutons, but Al Rose lithology is recognized at several places along front of Inyo Mountains east of Lone Pine, New York Butte 15-min quadrangle.

Source: Publication; US geologic names lexicon (USGS Bull. 1350, p. 20-21); GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Al Rose Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Great Basin province
Publication:

Stone, Paul, Dunne, G.C., Stevens, C.H., and Gulliver, R.M., 1989, Geologic map of Paleozoic and Mesozoic rocks in parts of the Darwin and adjacent quadrangles, Inyo County, California: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1932, scale 1:31,250


Summary:

Unit geographically extended into area of report in Talc City Hills. Previously mapped as unit c of Pogonip Group by Hall and MacKevet (1962). Age is Early Ordovician.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


Search archives

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).