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Laketown Dolomite, USA

Formation	Laketown Dolomite
Member(s)	Gettel Lake High Lake Jack Valley Portage Canyon Tony Grove Lake
Age:	433 - 427 Ma Silurian
Interval	Llandovery - Wenlock
Tectonic Setting	Cratonic basin
Lithology	dolomite
Number of Collections	3
Number of Occurrences	46

Recorded Sample Locations

Location	Region	Stratigraphic Name
Atrypina Community	Nye County, Nevada, USA	Laketown Dolomite
Protathyris Community of the Laketown Dolomite	Lincoln County, Nevada, USA	Laketown Dolomite
Spirinella Community in the Laketown Dolomite	Utah County, Utah, USA	Laketown Dolomite - Jack Valley
Ely Springs Dolomite	Churchill County, Nevada, USA	Laketown Dolomite
Tony Grove Lake Member	White Pine County, Nevada, USA	Laketown Dolomite - Tony Grove Lake
BH-14. Barn Hills	Millard County, Utah, USA	Laketown Dolomite - Jack Valley

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Ely Springs Dolomite - Floride	458 - 443 Ma Paleozoic	dolomite	7
Ely Springs Dolomite - Lost Canyon	458 - 443 Ma Paleozoic	dolomite	7
Fish Haven Dolostone	458 - 443 Ma Paleozoic	dolomite	7
Hanson Creek - middle	450 - 444 Ma Paleozoic	limestone, dolomite	55
Laketown Dolomite - Gettel Lake	441 - 427 Ma Silurian	dolomite	10
Laketown Dolomite - High Lake	441 - 439 Ma Silurian	dolomite	50
Laketown Dolomite - Jack Valley	439 - 427 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*	443.4 - 427.4 Ma Silurian
Protathyris sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : *Protathyris*	433.4 - 427.4 Ma Silurian
Hyattidina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Meristellidae : *Hyattidina*	443.4 - 440.8 Ma Silurian
Meristina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Meristellidae : *Meristina*	433.4 - 427.4 Ma Silurian
Atrypida order	4	Animalia : Brachiopoda : Rhynchonellata : Atrypida	443.4 - 440.8 Ma Silurian
Pentlandella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Anazygidae : *Pentlandella*	443.4 - 427.4 Ma Silurian
Atrypa sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : *Atrypa*	443.4 - 427.4 Ma Silurian
Atrypa hedei species	7	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : Atrypa : *Atrypa hedei*	440.8 - 438.5 Ma Silurian
Atrypidae family	5	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae	443.4 - 427.4 Ma Silurian
Plectatrypa sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : *Plectatrypa*	443.4 - 440.8 Ma Silurian
Plectatrypa imbricata species	7	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : Plectatrypa : *Plectatrypa imbricata*	443.4 - 427.4 Ma Silurian
Atrypina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypinidae : *Atrypina*	443.4 - 427.4 Ma Silurian
Spirigerina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypinidae : *Spirigerina*	443.4 - 427.4 Ma Silurian
Orthida order	4	Animalia : Brachiopoda : Rhynchonellata : Orthida	443.4 - 427.4 Ma Silurian
Isorthis sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Isorthis*	443.4 - 427.4 Ma Silurian
Resserella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Resserella*	440.8 - 438.5 Ma Silurian
Dicoelosia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dicoelosiidae : *Dicoelosia*	443.4 - 427.4 Ma Silurian
Dicoelosia biloba species	7	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dicoelosiidae : Dicoelosia : *Dicoelosia biloba*	443.4 - 427.4 Ma Silurian
Dolerorthidae family	5	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dolerorthidae	440.8 - 438.5 Ma Silurian
Dolerorthis sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Hesperorthidae : *Dolerorthis*	438.5 - 433.4 Ma Silurian
Dolerorthis flabellites species	7	Animalia : Brachiopoda : Rhynchonellata : Orthida : Hesperorthidae : Dolerorthis : *Dolerorthis flabellites*	443.4 - 427.4 Ma Silurian
Flabellitesia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Hesperorthidae : *Flabellitesia*	443.4 - 427.4 Ma Silurian
Platystrophia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Platystrophiidae : *Platystrophia*	443.4 - 440.8 Ma Silurian
Dalejina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Rhipidomellidae : *Dalejina*	443.4 - 427.4 Ma Silurian
Pentamerida order	4	Animalia : Brachiopoda : Rhynchonellata : Pentamerida	440.8 - 438.5 Ma Silurian
Camerella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Camerellidae : *Camerella*	443.4 - 427.4 Ma Silurian
Pentameroides sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Pentameridae : *Pentameroides*	443.4 - 427.4 Ma Silurian
Pentamerus sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Pentameridae : *Pentamerus*	443.4 - 440.8 Ma Silurian
Microcardinalia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Stricklandiidae : *Microcardinalia*	443.4 - 427.4 Ma Silurian
Virgiana utahensis species	7	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Virgianidae : Virgiana : *Virgiana utahensis*	443.4 - 440.8 Ma Silurian
Rhynchonellida order	4	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida	443.4 - 440.8 Ma Silurian
Camarotoechia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Camarotoechiidae : *Camarotoechia*	433.4 - 427.4 Ma Silurian
Rhynchonellidae family	5	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Rhynchonellidae	443.4 - 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*	443.4 - 427.4 Ma Silurian
Hedeina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Cyrtiidae : *Hedeina*	443.4 - 427.4 Ma Silurian
Howellella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Delthyrididae : *Howellella*	443.4 - 427.4 Ma Silurian
Spirinella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Reticulariidae : *Spirinella*	443.4 - 427.4 Ma Silurian
Protochonetes sp. genus	6	Animalia : Brachiopoda : Strophomenata : Productida : Strophochonetidae : *Protochonetes*	443.4 - 427.4 Ma Silurian
Protochonetes elyensis species	7	Animalia : Brachiopoda : Strophomenata : Productida : Strophochonetidae : Protochonetes : *Protochonetes elyensis*	438.5 - 427.4 Ma Silurian
Davidsoniacea superfamily	4.7	Animalia : Brachiopoda : Strophomenata : Strophomenida : Davidsoniacea	440.8 - 438.5 Ma Silurian
Strophomenida order	4	Animalia : Brachiopoda : Strophomenata : Strophomenida	443.4 - 427.4 Ma Silurian
Plectambonitidae family	5	Animalia : Brachiopoda : Strophomenata : Strophomenida : Plectambonitidae	443.4 - 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*	440.8 - 438.5 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
Pentlandia sp. genus	6	Animalia : Chordata : Osteichthyes : Phaneropleuridae : *Pentlandia*	440.8 - 438.5 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
Palaeocyclus sp. genus	6	Animalia : Cnidaria : Anthozoa : Palaeocyclidae : *Palaeocyclus*	443.4 - 427.4 Ma Silurian
Rhabdocyclus sp. genus	6	Animalia : Cnidaria : Anthozoa : Palaeocyclidae : *Rhabdocyclus*	443.4 - 427.4 Ma Silurian
Tryplasma sp. genus	6	Animalia : Cnidaria : Anthozoa : Tryplasmatidae : *Tryplasma*	443.4 - 427.4 Ma Silurian
Amplexoides sp. genus	6	Animalia : Cnidaria : Anthozoa : Amplexidae : *Amplexoides*	443.4 - 427.4 Ma Silurian
Ptychophyllum sp. genus	6	Animalia : Cnidaria : Anthozoa : Arachnophyllidae : *Ptychophyllum*	443.4 - 427.4 Ma Silurian
Asthenophyllum sp. genus	6	Animalia : Cnidaria : Anthozoa : Streptelasmatidae : *Asthenophyllum*	443.4 - 427.4 Ma Silurian
Bighornia sp. genus	6	Animalia : Cnidaria : Anthozoa : Streptelasmatidae : *Bighornia*	458.4 - 443.4 Ma Paleozoic
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. (1980) The Late Ordovician and Silurian of the Eastern Great Basin, Part 3. Brachiopods of the Tony Grove Lake Member of the Laketown Dolomite, Milwaukee Public Museum Contributions in Biology and Geology 30, 1-23

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

Elias R. J. (1983) Late Ordovician solitary rugose corals of the Stony Mountain Formation, southern Manitoba, and its equivalents, Journal of Paleontology 57 5, 924-956

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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