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Monola Formation
Stratigraphic range: Middle Cambrian [1]
TypeFormation
OverliesMule Spring Limestone
Lithology
PrimaryShale
OtherClay, Mudstone, Limestone, Siltstone
Location
RegionCalifornia
CountryUnited States

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

Geology

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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

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

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

Arthropoda

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Genus Species Notes Images
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

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References

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  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. ^ a b c d e f g h i j k 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. ^ a b c d e f 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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