Monola Formation

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Monola Formation
Stratigraphic range: Middle Cambrian
Type Formation
Overlies Mule Spring Limestone
Lithology
Primary Shale
Other Clay, Mudstone, Limestone, Siltstone
Location
Region California
Country United States

The Monola Formation is a geologic formation in California. It preserves fossils dating back to the Cambrian period.

Contents

Geology

The Monola Formation is primarily composed of siliceous shales, and greyish-black clay shale, and calcareous siltstone. In parts of the siliceous shale, there are occasional layers of lime mudstone and bioclastic limestone. [2]

Paleobiota

The Monola Limestone contains a small collection of trilobites, like Glosopleura and Alokistocare . [3]

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Arthropoda

GenusSpeciesNotesImages
Alokistocare [3]
  • Alokistocare sp.
Ptychoparid trilobite.
Syspacephalus [3]
  • Syspacephalus sp.
Ptychoparid trilobite.
Paraantagmus [2]
  • P. latus
Ptychoparid trilobite.
Amecephalus [2]
  • A. arrojosensis
Ptychoparid trilobite.
Mexicella [2]
  • M. robusta
Ptychoparid trilobite.
Onchocephalites [2]
  • O. laevis
  • O. resseri
Ptychoparid trilobite.
Syspacephalus [2]
  • S. variosus
  • S. granulosus (?)
Ptychoparid trilobite.
Tonopahella [2]
  • T. goldfieldensis
  • T. walcotii (?)
Ptychoparid trilobite.
Nyella (?) [2]
  • N. (?) plana
Ptychoparid trilobite.
Glossopleura [3]
  • Glossopleura sp.
Corynexochid trilobite.
Oryctocephalus [3] [2]
  • Oryctocephalus sp.
  • O. orientalis
  • O. indicus
  • O. nyensis
Corynexochid trilobite.
Microryctocara [2]
  • M. nevadensis
Corynexochid trilobite.
Bathyuriscus [2]
  • Bathyuriscus sp.
Corynexochid trilobite, previously reported as Wenkchemnia sulcata and W. spinicollis.
Ogygopsis [3]
  • Ogygopsis sp.
Dorypygid trilobite.

See also

References

  1. ↑ Stewart, J. H. "Upper Precambrian and Lower Cambrian Strata, in the Southern Great Basin California and Nevada" (PDF). U.S. Geological Survery. Geological Survey Professional.
  2. 1 2 3 4 5 6 7 8 9 10 11 Sundberg, Frederick A.; McCollum, Linda B. (September 2003). "Early and Mid Cambrian trilobites from the outer‐shelf deposits of Nevada and California, USA". Palaeontology. 46 (5): 945–986. doi:10.1111/1475-4983.00328.
  3. 1 2 3 4 5 6 Alpert, Stephen P. (1976). "Trilobite and Star-like Trace Fossils from the White-Inyo Mountains, California". Journal of Paleontology. 50 (2): 226–239. ISSN   0022-3360.
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