Mule Spring Limestone

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Mule Spring Limestone
Stratigraphic range: Lower Cambrian
Type Formation
Underlies
Overlies
Thickness0–1,000 feet (0–305 m) [1]
Lithology
Primary Limestone
Other Siltstone, Shale,
Location
Region Mojave Desert, California, Nevada
Country United States

The Mule Spring Limestone is a geologic formation in the Saline Range of eastern California and Split Mountain and Goldfield Hills of Nevada.

Contents

It is also to be found in the Inyo Mountains and White Mountains.

It preserves fossils, such as trilobites, and algal structures like Girvanella, dating back to the Cambrian period. [2] [1]

Geology

The Mule Spring Limestone, as its name suggests, is mainly composed of limestone rocks. These rocks are medium-gray to light-medium-gray, as well as very fine to fine crystalline, and is thin to very thin-bedded in most areas. In the lower sections of the formation, there are also occasional layers, up to 500 ft (150 m) thick, of pale-yellowish-brown or greenish-gray shale, limy siltstone and silty limestone. [1] In the Split Mountain, the formation overlies the Harkless Formation and underlies the Emigrant Formation, [1] [3] whilst in other areas it overlies the Saline Valley Formation and underlies the Monola Formation. [1]

Paleobiota

The Mule Spring Limestone contains examples of Archaeocyatha, a clade of sponges that went extinct during this time, [4] as well as a collection of trilobites. [2] [1]

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
Bristolia [1] [2] [5] [3]
  • Bristolia sp.
  • B. harringtoni
  • B. insolens
  • B. bristolensis
  • B. anteros
  • B. fragilis
Biceratopsid trilobites.
Bristolia bristolensis cephalon negative CRF.jpg
Peachella [1] [2] [5]
  • Peachella sp.
Biceratopsid trilobite.
Mesonacis [2]
  • Mesonacis sp.
Olenellid trilobite. Mesonacis sp. previously described as Fremontia sp. which was later synonymised into Mesonacis. [1]
Mesonacis NMNH.jpg
Olenellus [2] [5] [6] [3]
  • Olenellus sp.
  • O. puertoblancoensis(?)
Olenellid trilobite. Olenellus sp. previously described as Paedumias sp. which was later synonymised into Olenellus. [1]
Onchocephalus [2] [5]
  • Onchocephalus sp.
Ptychoparid trilobite.
Ptychoparioid [2] [6] [3]
  • Ptychoparioid sp. A
  • Ptychoparioid sp. B
  • Ptychoparioid sp. C
  • Ptychoparioid sp. D
Ptychoparid trilobites.
Bonnia [1] [2] [5] [3]
  • Bonnia sp.
Dorypygid trilobite.
Crassifimbra [3]
  • Crassifimbra sp.
Trilobite, family unknown.

Porifera (Sponges)

GenusSpeciesNotesImages
Archaeocyathus [4]
  • Archaeocyathus sp.
Archaeocyathide sponge.
Archaeocyathus atlanticus.jpg

Flora

GenusSpeciesNotesImages
Girvanella [1]
  • Girvanella sp.
Cyanobacteria structures.

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 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 Mule Spring Limestone Formation Trilobites
  3. 1 2 3 4 5 6 Sundberg, Frederick A.; Webster, Mark (July 2022). ""Ptychoparioid" trilobites of the Harkless Formation and Mule Spring Limestone (Cambrian Series 2, Stage 4), Clayton Ridge, Nevada". Journal of Paleontology. 96 (4): 886–920. doi:10.1017/jpa.2021.124.
  4. 1 2 Pruss, Sara B.; Karbowski, Grace; Zhuravlev, Andrey Yu; Webster, Mark; Smith, Emily F. (30 June 2024). "DEAD CLADE WALKING: THE PERSISTENCE OF ARCHAEOCYATHUS IN THE AFTERMATH OF EARLY CAMBRIAN REEF EXTINCTION IN THE WESTERN UNITED STATES". Palaios. 39 (6): 210–224. doi:10.2110/palo.2024.005.
  5. 1 2 3 4 5 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.
  6. 1 2 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.
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