Monola Formation

Monola Formation
Stratigraphic range: Middle Cambrian
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

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.

Paleobiota

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

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

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