# Monola Formation

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The **Monola Formation** is a [geologic formation](/source/Formation_(geology)) in [California](/source/California). It preserves [fossils](/source/Fossils) dating back to the [Cambrian](/source/Cambrian) [period](/source/Period_(geology)).

## Geology

The Monola Formation is primarily composed of siliceous [shales](/source/Shale), and greyish-black [clay](/source/Clay) shale, and calcareous [siltstone](/source/Siltstone). In parts of the siliceous shale, there are occasional layers of lime [mudstone](/source/Mudstone) and [bioclastic](/source/Bioclast) [limestone](/source/Limestone).[2]

## Paleobiota

The Monola Limestone contains a small collection of [trilobites](/source/Trilobite), like *[Glosopleura](/source/Glosopleura)* and *[Alokistocare](/source/Alokistocare)*.[3]

### Arthropoda

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

- [List of fossiliferous stratigraphic units in California](/source/List_of_fossiliferous_stratigraphic_units_in_California)
- [Paleontology in California](/source/Paleontology_in_California)

## References

1. Stewart, J. H. ["Upper Precambrian and Lower Cambrian Strata, in the Southern Great Basin California and Nevada"](https://pubs.usgs.gov/pp/0620/report.pdf). *U.S. Geological Survery*. Geological Survey Professional.

1. 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](https://doi.org/10.1111/1475-4983.00328)

1. Alpert, Stephen P. (1976). ["Trilobite and Star-like Trace Fossils from the White-Inyo Mountains, California"](https://www.jstor.org/stable/1303490). *Journal of Paleontology*. **50** (2): 226–239. [ISSN 0022-3360](https://www.worldcat.org/issn/0022-3360)

- ((Various Contributors to the Paleobiology Database)). ["Fossilworks: Gateway to the Paleobiology Database"](https://www.fossilworks.org). Retrieved 17 December 2021.

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