Monola Formation

Monola Formation
Monola Formation
Stratigraphic range: Middle Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
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.

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 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
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.

References

↑ 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.
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.
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.

Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.

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[Stewart1970-1] 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.

[Sundberg2003-2] 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.

[Alpert1976-3] 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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Monola Formation

Contents

Geology

Paleobiota

Arthropoda

See also

References

Monola Formation
Stratigraphic range: Middle Cambrian PreꞒ Ꞓ O S D C P T J K Pg N ^[1]
Type	Formation
Overlies	Mule Spring Limestone
Lithology
Primary	Shale
Other	Clay, Mudstone, Limestone, Siltstone
Location
Region	California
Country	United States