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Laketown Dolomite - Jack Valley, USA

Formation	Laketown Dolomite
Member	Jack Valley
Age:	439 - 427 Ma Silurian
Interval	Llandovery - Wenlock
Tectonic Setting	Cratonic basin
Lithology	dolomite
Number of Collections	7
Number of Occurrences	50

Recorded Sample Locations

Location	Region	Stratigraphic Name
Spirinella Community in the Laketown Dolomite	Utah County, Utah, USA	Laketown Dolomite - Jack Valley
Tony Grove Lake Member	White Pine County, Nevada, USA	Laketown Dolomite - Jack Valley
BH-14. Barn Hills	Millard County, Utah, USA	Laketown Dolomite - Jack Valley

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Laketown Dolomite - Gettel Lake	441 - 427 Ma Silurian	dolomite	10
Laketown Dolomite - High Lake	441 - 439 Ma Silurian	dolomite	50
Laketown Dolomite - Portage Canyon	439 - 427 Ma Silurian	dolomite	18
Laketown Dolomite - Tony Grove Lake	443 - 441 Ma Silurian	dolomite	19
Lone Mountain Dolomite	439 - 427 Ma Silurian	dolomite	1

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Ferganella borealis species	7	*Ferganella borealis*	438.5 - 427.4 Ma Silurian
Atrypa sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : *Atrypa*	438.5 - 427.4 Ma Silurian
Plectatrypa imbricata species	7	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : Plectatrypa : *Plectatrypa imbricata*	438.5 - 427.4 Ma Silurian
Atrypina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypinidae : *Atrypina*	438.5 - 427.4 Ma Silurian
Orthida order	4	Animalia : Brachiopoda : Rhynchonellata : Orthida	438.5 - 427.4 Ma Silurian
Dicoelosia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dicoelosiidae : *Dicoelosia*	438.5 - 427.4 Ma Silurian
Dolerorthis flabellites species	7	Animalia : Brachiopoda : Rhynchonellata : Orthida : Hesperorthidae : Dolerorthis : *Dolerorthis flabellites*	438.5 - 427.4 Ma Silurian
Dalejina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Rhipidomellidae : *Dalejina*	438.5 - 427.4 Ma Silurian
Pentamerida order	4	Animalia : Brachiopoda : Rhynchonellata : Pentamerida	438.5 - 427.4 Ma Silurian
Camerella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Camerellidae : *Camerella*	438.5 - 427.4 Ma Silurian
Ancillotoechia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Trigonirhynchiidae : *Ancillotoechia*	443.4 - 427.4 Ma Silurian
Spiriferida order	4	Animalia : Brachiopoda : Rhynchonellata : Spiriferida	443.4 - 427.4 Ma Silurian
Cyrtia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferinida : Syringothyrididae : *Cyrtia*	438.5 - 427.4 Ma Silurian
Hedeina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Cyrtiidae : *Hedeina*	438.5 - 427.4 Ma Silurian
Spirinella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Reticulariidae : *Spirinella*	443.4 - 427.4 Ma Silurian
Protochonetes elyensis species	7	Animalia : Brachiopoda : Strophomenata : Productida : Strophochonetidae : Protochonetes : *Protochonetes elyensis*	438.5 - 427.4 Ma Silurian
Strophomenida order	4	Animalia : Brachiopoda : Strophomenata : Strophomenida	438.5 - 427.4 Ma Silurian
Leptaena sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Rafinesquinidae : *Leptaena*	438.5 - 427.4 Ma Silurian
Eoplectodonta sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Sowerbyellidae : *Eoplectodonta*	438.5 - 427.4 Ma Silurian
Strophoprion geniculatum species	7	Animalia : Brachiopoda : Strophomenata : Strophomenida : Strophonellidae : Strophonella : *Strophoprion geniculatum*	443.4 - 427.4 Ma Silurian
Walliserodus sp. genus	6	Animalia : Chordata : Belodellidae : *Walliserodus*	438.5 - 433.4 Ma Silurian
Pterospathodus amorphognathoides species	7	Animalia : Chordata : Balognathidae : Pterospathodus : *Pterospathodus amorphognathoides*	438.5 - 433.4 Ma Silurian
Distomodus staurognathoides species	7	Animalia : Chordata : Conodonta : Distomodontidae : Distomodus : *Distomodus staurognathoides*	438.5 - 433.4 Ma Silurian
Aspelundia fluegeli species	7	Animalia : Chordata : Conodonta : Aspelundia : *Aspelundia fluegeli*	438.5 - 433.4 Ma Silurian
Aulacognathus sp. genus	6	Animalia : Chordata : Conodonta : *Aulacognathus*	438.5 - 433.4 Ma Silurian
Spathognathodus sp. genus	6	Animalia : Chordata : Conodonta : *Spathognathodus*	438.5 - 433.4 Ma Silurian
Pseudolonchodina sp. genus	6	Animalia : Chordata : Conodonta : Prioniodinidae : *Pseudolonchodina*	438.5 - 433.4 Ma Silurian
Wurmiella polinclinata species	7	Animalia : Chordata : Conodonta : Ozarkodinida : Spathognathodontodae : Wurmiella : *Wurmiella polinclinata*	438.5 - 433.4 Ma Silurian
Nudibelodina sensitiva species	7	Animalia : Chordata : Panderodontidae : Nudibelodina : *Nudibelodina sensitiva*	438.5 - 433.4 Ma Silurian
Panderodus sp. genus	6	Animalia : Chordata : Distacodontidae : *Panderodus*	438.5 - 433.4 Ma Silurian
Acodus langkawiensis species	7	Animalia : Chordata : Distacodontidae : Panderodus : *Acodus langkawiensis*	438.5 - 433.4 Ma Silurian
Rugosa subclass	3.3	Animalia : Cnidaria : Anthozoa : Rugosa	443.4 - 427.4 Ma Silurian
Rhizophyllum sp. genus	6	Animalia : Cnidaria : Anthozoa : Goniophyllidae : *Rhizophyllum*	443.4 - 427.4 Ma Silurian
Asthenophyllum sp. genus	6	Animalia : Cnidaria : Anthozoa : Streptelasmatidae : *Asthenophyllum*	443.4 - 427.4 Ma Silurian
Jinonicella kolebabai species	7	Animalia : Mollusca : Rostroconchia : Ribeirioida : Jinonicella : *Jinonicella kolebabai*	438.5 - 433.4 Ma Silurian

References

Sheehan P. M. (1980) Paleogeography and marine communities of the Silurian carbonate shelf in Utah and Nevada, in T. D. Fouch and E. R. Magathan, eds. Paleozoic paleogeography of west-central United States. Rocky Mountain Section, SEPM, 19-37

Sheehan P. M. (1982) Late Ordovician and Silurian of the eastern Great Basin Part 4. Late Llandovery and Wenlock brachiopods, Milwaukee Public Museum Contributions in Biology and Geology 50, 1-73

Boucot A. J. (1999) Some Wenlockian-Geddinian, chiefly brachiopod dominated communities of North America, Paleocommunities--a case study from the Silurian and Lower Devonian, 549-591

Gubanov A. P., Ebbestad J.-O. R., et al (2017) The problematic mollusc Jinonicella from the Silurian of North America, Gff 139 doi:10.1080/11035897.2017.1291539

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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