Marble Mountains, near Cadiz (coll. Bradley and Mason 1934) (Cambrian of the United States)

Where: San Bernardino County, California (34.5° N, 115.5° W: paleocoordinates 2.1° S, 98.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bristolia trilobite zone, Latham Shale Formation (Cadiz Group), Dyeran (516.0 - 513.0 Ma)

• The stratigraphy of the formation has been fully dealt with in the reports of Hazzard7 and Hazzard and Mason.8 As established in the latter, the Cadiz formation consists of the upper 375 feet of the quartzite and shale unit originally noted as containing both Lower and Middle Cambrian fossils. The lower 100 feet of the unit as originally described is not included within the Cadiz formation as it is known to contain Mesonacidae. The exact contact between the Lower and Middle Cambrian beds has not been determined, but it is placed provisionally, at a buff, oolitic limestone and limy, glauconitic sandstone horizon about 100 feet above the top of the Lower Cambrian algal limestone. The fossils of the present report came from a thin-bedded limestone which weathers into small buff- colored blocks and plates, and from an underlying green shale. The thin-bedded limestone is immediately overlain by the heavy, dark gray limestone of the Bonanza King formation (Middle Cambrian). The green shale is probably not more than 50 feet lower in the formation. PJW: The Brisolia zone is now the Latham Shale

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone and green shale

• The stratigraphy of the formation has been fully dealt with in the reports of Hazzard7 and Hazzard and Mason.8 As established in the latter, the Cadiz formation consists of the upper 375 feet of the quartzite and shale unit originally noted as containing both Lower and Middle Cambrian fossils. The lower 100 feet of the unit as originally described is not included within the Cadiz formation as it is known to contain Mesonacidae. The exact contact between the Lower and Middle Cambrian beds has not been determined, but it is placed provisionally, at a buff, oolitic limestone and limy, glauconitic sandstone horizon about 100 feet above the top of the Lower Cambrian algal limestone. The fossils of the present report came from a thin-bedded limestone which weathers into small buff- colored blocks and plates, and from an underlying green shale. The thin-bedded limestone is immediately overlain by the heavy, dark gray limestone of the Bonanza King formation (Middle Cambrian). The green shale is probably not more than 50 feet lower in the formation.

Size classes: macrofossils, mesofossils

Collected by John H. Bradley and John F. Mason in 1934

Primary reference: J. F. Mason. 1935. Fauna of the Cambrian Cadiz Formation, Marble Mountains, California. Bulletin of the Southern California Academy of Sciences 34(2):97-120 [J. Marcot/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 191414: authorized by Jonathan Marcot, entered by Jonathan Marcot on 28.01.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Corynexochida - Zacanthoididae
Zacanthoides typicalis Walcott 1886 trilobite
 Corynexochida - Dorypygidae
Dorypyge quadriceps Hall and Whitfield 1877 trilobite
 Corynexochida - Corynexochidae
Corynexochus ? sp. Angelin 1854 trilobite
 Corynexochida - Dolichometopidae
Anoria lodensis Clark 1921 trilobite
Dolichometopus productus Hall and Whitfield 1877 trilobite
Bathyuriscus maximus n. sp. Mason 1935 trilobite
Bathyuriscus howelli Walcott 1886 trilobite
  - Anomocarellidae
Anomocarella ? spatha Mason 1935 trilobite
 Eodiscida - Eodiscidae
Pagetia clytia Walcott 1916 trilobite
 Ptychopariida -
Amecephalus strangulatus n. sp. Mason 1935 trilobite
 Ptychopariida - Acrocephalitidae
Acrocephalites ? trifossatus Mason 1935 trilobite
 Ptychopariida -
"Alokistocare linnarssoni" = Eldoradia linnarssoni, "Amecephalus piochensis" = Alokistocare piochensis
"Alokistocare linnarssoni" = Eldoradia linnarssoni Walcott 1884 trilobite
"Amecephalus piochensis" = Alokistocare piochensis Walcott 1886 trilobite
Hyolitha
 Hyolithida - Hyolithidae
"Hyolithes princeps" = Nevadotheca princeps, Hyolithes sp.
"Hyolithes princeps" = Nevadotheca princeps Billings 1872
Hyolithes sp. d'Eichwald 1840
Strophomenata
 Billingsellida - Billingsellidae
Brachiopoda
  -
Lingulata
 Lingulida - Obolidae
Westonia ella Walcott 1912
Coeloscleritophora
 Chancelloriida - Chancelloriidae
Chancelloria eros Walcott 1920