LSJU loc. 2776, Cottonwood Mountains: Arnsbergian, California
collected by J. F. McAllister and S. W. Muller 1947

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Pseudorthocerida - Pseudorthoceratidae
Mitorthoceras cf. perfilosum Gordon 1960
Mitorthoceras clinatum Gordon 1964
Cephalopoda - Hematitida - Hematitidae
? Hematites sp. Flower and Gordon 1959
Cephalopoda - Goniatitida - Glaphyritidae
Cravenoceras inyoense Gordon 1964
Eosyngastrioceras quadratum Titus 2000
Titus 2000
Cravenoceras hesperium Miller and Furnish 1940
Cephalopoda - Nautilida - Scyphoceratidae
Scyphoceras cf. cessator (Hall and Whitfield 1877)
Cephalopoda - Bactritida - Bactritidae
? Bactrites cf. carbonarius Smith 1903
see common names

Geography
Country:United States State/province:California County:Inyo
Coordinates: 36.8° North, 117.5° West (view map)
Paleocoordinates:3.0° North, 46.9° West
Basis of coordinate:estimated from map
Time
Period: Carboniferous Epoch: Mississippian
Stage: Serpukhovian 10 m.y. bin: Carboniferous 3
Key time interval: Arnsbergian
Age range of interval: 327.4 - 324 m.y. ago
Stratigraphy
Formation:Rest Spring
Stratigraphy comments: McAllister (1952) and Gordon (1964) say this is the uppermost 10 ft and probably lower 5 ft of Rest Spring Shale
If Perdido group, this would be the Mexican Spring Formation of Stevens et al., 1996
Titus (2000) says this is lower Rest Spring Shale, but doesn't give any evidence. Says "the formational contact between the Rest Spring Shale and the underlying Mexican Spring Formation essentially coincides with the Pendleian-Arnsbergian boundary" making this Arnsbergian if Rest Spring, or Pendleian if Mexican Spring.
Lithology and environment
Primary lithology:fine,gray "limestone"
Secondary lithology: calcareous siltstone
Includes fossils?Y
Lithology description: In the Quartz Spring area the Early Mississippian Tin Mountain Limestone is overlain by a sequence of varied beds that consists of calcareous siltstone, sand- stone, conglomerate and interbedded chert, limestone, silty limestone, and siltstone having some shale. These constitute the Perdido Formation of McAllister (1952, p. 22-25), approximately 610 feet thick in its composite type section south of Perdido Canyon and south of Rest Spring.The topmost bed of this formation, a dark-gray fine-grained limestone, 6 to 12 inches thick, is crowded with fossils, mostly Cravenoceras hesperium Miller and Furnish. Four to five feet of very soft shale, grayish red to purplish gray, separate it from the gray locally sandy limestone below that carries productids, spirifers, and other brachiopods.
Environment:marine indet. Tectonic setting:passive margin
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:surface (float),survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:CAS
Collectors:J. F. McAllister and S. W. Muller Collection dates:July 18, 1947
Metadata
Database number:217147
Authorizer:J. Marcot Enterer:J. Marcot
Modifier:J. Marcot Research group:marine invertebrate
Created:2021-01-26 18:15:04 Last modified:2021-01-26 19:51:09
Access level:the public Released:2021-01-26 18:15:04
Creative Commons license:CC BY
Reference information

Primary reference:
70706. M. Gordon, Jr. 1964. California Carboniferous cephalopods. United States Geological Survey Professional Paper 483-A:A1-A27 [J. Marcot/J. Marcot/J. Marcot]

Secondary references:

75314 A. L. Titus. 2000. Late Mississippian (Arnsbergian Stage-E2 Chronozone) ammonoid paleontology and biostratigraphy of the Antler Foreland Basin, California, Nevada, Utah. Utah Geological Survey Bulletin 131:1-109 [J. Marcot/J. Marcot]