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// Workers AI · dad joke modeDoes Emigrant Springs Formation rock? Yes, it's a stone-cold migrant.

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From Wikipedia, the free encyclopedia
Emigrant Springs Formation
Stratigraphic range: Middle Cambrian–Upper Cambrian [1]
TypeFormation
Sub-unitsSee: Members
UnderliesDunderberg Formation
OverliesPatterson Pass Shale
Lithology
PrimaryCalcisiltite
OtherMudstone, Calcilutite, Calcarenite
Location
RegionNevada
CountryUnited States

The Emigrant Springs Formation (Also known as the Emigrant Springs Limestone) is a geologic formation in Nevada. It preserves fossils dating back to the Cambrian period.

Geology

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The Emigrant Springs Formation is predominately composed of various carbonate rocks, and is overlain by the Dunderberg Formation, whilst it is underlain by the Patterson Pass Shale. It also contains three members, which are as follows, in ascending stratigraphic order (lowest to highest):

Members

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  • Member A: This member is the thinnest, only getting up to 256 ft (78 m) thick, and is composed of medium-gray, thin to medium-bedded calcisiltite and calcilutite, with breccia's in the upper beds of the member.[1]
  • Member B: This member is the thickest, getting up to 1,509 ft (460 m) thick, and is dominated by light-olive-gray, yellowish or pink calcisiltite, which contains silt-sized quartz grains. At the base of this member, there are also mudstones present, transitioning to medium-light-gray, thin to thick-bedded calcisiltite and calcilutite above.[1]
  • Member C: This member can get up to 495 ft (151 m) thick, and is primarily composed of medium-gray oolitic calcarenite, calcilutite and calcisiltite.[1]

Paleobiota

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The Emigrant Springs Formation contains a small number of trilobites,[1] and a collection of conodonts, and various molluscs.[2]

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

[edit]
Arthropoda
Genus Species Notes Images
Coosina[1]
  • Coosina sp.
 Ptychoparid trilobite.
Blountia[1]
  • Blountia sp.
 Ptychoparid trilobite.
Crepicephalus[1]
  • Crepicephalus sp.
 Ptychoparid trilobite.
Tricrepicephalus[1]
  • Crepicephalus sp.
 Ptychoparid trilobite.
Pemphigaspis[1]
  • Pemphigaspis sp.
 Ptychoparid trilobite.
Elrathia[2]
  • E. alapyge
 Ptychoparid trilobite.
Cedaria (?)[1]
  • Cedaria (?) sp.
 Ptychoparid trilobite.
Meteoraspis (?)[1]
  • Meteoraspis (?) sp.
 Ptychoparid trilobite.
Baltagnostus[2]
  • Baltagnostus sp.
  • B. eurypyx
 Diplagnostid agnostid.
Hypagnostus[2]
  • Hypagnostus sp.
 Diplagnostid agnostid.
Pseudagnostus[1]
  • Pseudagnostus sp.
 Agnostid trilobite.
Utagnostus[1]
  • U. trispinulus
 Agnostid trilobite.
Kymagnostus (?)[1]
  • Kymagnostus (?) sp.
 Agnostid trilobite.
Lejopyge[2][1]
  • L. calva
Ptychagnostid agnostid.
Ptychagnostus[2]
  • Ptychagnostus sp.
  • P. aculeatus
 Ptychagnostid agnostid.
Glaphyraspis[1]
  • Glaphyraspis sp.
 Trilobite.
Cheliacephalus[1]
  • Cheliacephalus sp.
 Trilobite.
Aphelaspis[1]
  • Aphelaspis sp.
 Trilobite.

Chordata

[edit]
Genus Species Notes Images
Hertzina[2]
  • H. bisulcata
 Furnishinid paraconodont.
Westergaardodina[2]
  • W. muelleri
 Westergaardodinid paraconodont.
Furnishina[2]
  • F. asymmetrica
  • F. furnishi
  • F. bicarinata
 Furnishinid paraconodont.
Distacodus[2]
  • D. palmeri
 Distacodontid conodont.
Oneotodus[2]
  • O. tenuis
 Protopanderodontid tenuis.

Lophotrochozoa

[edit]
Genus Species Notes Images
Helcionella[2]
  • Helcionella sp.
 Helcionellid mollusc.
Scenella (?)[2]
  • Scenella (?) sp.
 Scenellid mollusc.
Canthylotreta[3]
  • C. crista
 Acrotretid brachiopod.
Lingulella[2]
  • Lingulella sp.
 Obolid brachiopod.
Livnarssonia[2]
  • L. ophirensis
 Brachiopod.
Paterina[2]
  • Paterina sp.
 Brachiopod.

See also

[edit]

References

[edit]
  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Kellogg, Harold E. (1963). "Paleozoic Stratigraphy of the Southern Egan Range, Nevada". Geological Society of America Bulletin. 74 (6): 685. doi:10.1130/0016-7606(1963)74[685:PSOTSE]2.0.CO;2.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Clark, David L.; Robison, Richard A. (1969). "Oldest Conodonts in North America". Journal of Paleontology. 43 (4): 1044–1046. ISSN 0022-3360.
  3. ↑ Streng, Michael; Holmer, Lars E. (January 2006). "New and poorly known acrotretid brachiopods (Class Lingulata) from the Cedaria-Crepicephalus zone (late Middle Cambrian) of the Great Basin, USA". Geobios. 39 (1): 125–154. doi:10.1016/j.geobios.2004.10.004.


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