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Platteville - McGregor - Mifflin, USA

Group	Platteville
Formation	McGregor
Member	Mifflin
Age:	461 - 450 Ma Ordovician
Interval	Caradoc
Lithology	mudstone/packstone, "limestone"
Number of Collections	7
Number of Occurrences	94

Recorded Sample Locations

Location	Region	Stratigraphic Name
Hesperorthis-Eoleperditia community	Grant County, Wisconsin, USA	Platteville - McGregor - Mifflin
McCray Quarry	Newton County, Indiana, USA	Platteville - McGregor - Mifflin
Burlington Railroad exposure	Ogle County, Illinois, USA	Platteville - McGregor - Mifflin
Locality 1	Green County, Wisconsin, USA	Platteville - McGregor - Mifflin
Quarry 3.6 miles west-northwest of Fennimore	Grant County, Wisconsin, USA	Platteville - McGregor - Mifflin

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Eoleperditia sp. genus	6	Animalia : Arthropoda : Ostracoda : Leperditiidae : *Eoleperditia*	460.9 - 449.5 Ma Ordovician
Isotelus sp. genus	6	Animalia : Arthropoda : Trilobita : Asaphida : Asaphidae : *Isotelus*	460.9 - 449.5 Ma Ordovician
Bumastus sp. genus	6	Animalia : Arthropoda : Trilobita : Corynexochida : Illaenidae : *Bumastus*	460.9 - 449.5 Ma Ordovician
Illaenus sp. genus	6	Animalia : Arthropoda : Trilobita : Corynexochida : Illaenidae : *Illaenus*	460.9 - 449.5 Ma Ordovician
Ceraurus sp. genus	6	Animalia : Arthropoda : Trilobita : Phacopida : Cheiruridae : *Ceraurus*	460.9 - 449.5 Ma Ordovician
Encrinurus sp. genus	6	Animalia : Arthropoda : Trilobita : Phacopida : Encrinuridae : *Encrinurus*	460.9 - 449.5 Ma Ordovician
Onniella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Onniella*	460.9 - 449.5 Ma Ordovician
Pionodema sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Draboviidae : *Pionodema*	460.9 - 449.5 Ma Ordovician
Hesperorthis sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Hesperorthidae : *Hesperorthis*	460.9 - 449.5 Ma Ordovician
Campylorthis sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Plaesiomyidae : *Campylorthis*	460.9 - 449.5 Ma Ordovician
Campylorthis deflecta species	7	Animalia : Brachiopoda : Rhynchonellata : Orthida : Plaesiomyidae : Campylorthis : *Campylorthis deflecta*	460.9 - 449.5 Ma Ordovician
Dinorthis sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Plaesiomyidae : *Dinorthis*	460.9 - 449.5 Ma Ordovician
Rhynchotrema sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Rhynchotrematidae : *Rhynchotrema*	460.9 - 449.5 Ma Ordovician
Rostricellula minnesotensis species	7	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Trigonirhynchiidae : Rostricellula : *Rostricellula minnesotensis*	460.9 - 449.5 Ma Ordovician
Rafinesquina sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Rafinesquinidae : *Rafinesquina*	460.9 - 449.5 Ma Ordovician
Oepikina minnesotensis species	7	Animalia : Brachiopoda : Strophomenata : Strophomenida : Strophomenidae : Oepikina : *Oepikina minnesotensis*	460.9 - 449.5 Ma Ordovician
Opikina sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Strophomenidae : *Opikina*	460.9 - 449.5 Ma Ordovician
Strophomena sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Strophomenidae : *Strophomena*	460.9 - 449.5 Ma Ordovician
Strophomena plattinensis species	7	Animalia : Brachiopoda : Strophomenata : Strophomenida : Strophomenidae : Strophomena : *Strophomena plattinensis*	460.9 - 449.5 Ma Ordovician
Lambeophyllum sp. genus	6	Animalia : Cnidaria : Anthozoa : Lambelasmatidae : *Lambeophyllum*	460.9 - 449.5 Ma Ordovician
Praepleurocystis watkinsi species	7	Animalia : Echinodermata : Rhombifera : Pleurocystitidae : Praepleurocystis : *Praepleurocystis watkinsi*	460.9 - 449.5 Ma Ordovician
Vanuxemia sp. genus	6	Animalia : Mollusca : Bivalvia : Myalinida : Myalinidae : *Vanuxemia*	460.9 - 449.5 Ma Ordovician
Praenucula sp. genus	6	Animalia : Mollusca : Bivalvia : Nuculida : Praenuculidae : *Praenucula*	460.9 - 449.5 Ma Ordovician
Actinoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Actinoceratidae : *Actinoceras*	460.9 - 449.5 Ma Ordovician
Michelinoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Orthoceratidae : *Michelinoceras*	460.9 - 449.5 Ma Ordovician
Phragmolites sp. genus	6	Animalia : Mollusca : Gastropoda : Bucaniidae : *Phragmolites*	460.9 - 449.5 Ma Ordovician
Phragmolites triangularis species	7	Animalia : Mollusca : Gastropoda : Bellerophontida : Bucaniidae : Phragmolites : *Phragmolites triangularis*	460.9 - 449.5 Ma Ordovician
Salpingostoma buelli species	7	Animalia : Mollusca : Gastropoda : Bucaniidae : Salpingostoma : *Salpingostoma buelli*	460.9 - 449.5 Ma Ordovician
Bellerophon wisconsinensis species	7	Animalia : Mollusca : Gastropoda : Bucaniidae : Tetranota : *Bellerophon wisconsinensis*	460.9 - 449.5 Ma Ordovician
Delthyris expansus species	7	Animalia : Mollusca : Gastropoda : Pterothecidae : Pterotheca : *Delthyris expansus*	460.9 - 449.5 Ma Ordovician
Pterotheca intermedia species	7	Animalia : Mollusca : Gastropoda : Pterothecidae : Pterotheca : *Pterotheca intermedia*	460.9 - 449.5 Ma Ordovician
Sinuites sp. genus	6	Animalia : Mollusca : Gastropoda : Sinuitidae : *Sinuites*	460.9 - 449.5 Ma Ordovician
Helicotoma planulata species	7	Animalia : Mollusca : Gastropoda : Helicotomidae : Helicotoma : *Helicotoma planulata*	460.9 - 449.5 Ma Ordovician
Ophiletina sp. genus	6	Animalia : Mollusca : Gastropoda : Helicotomidae : *Ophiletina*	460.9 - 449.5 Ma Ordovician
Ophiletina sublaxa species	7	Animalia : Mollusca : Gastropoda : Helicotomidae : Ophiletina : *Ophiletina sublaxa*	460.9 - 449.5 Ma Ordovician
Holopea ampla species	7	Animalia : Mollusca : Gastropoda : Holopeidae : Holopea : *Holopea ampla*	460.9 - 449.5 Ma Ordovician
Raphistomina modesta species	7	Animalia : Mollusca : Gastropoda : Holopeidae : Raphistomina : *Raphistomina modesta*	460.9 - 449.5 Ma Ordovician
Eccyliopterus beloitensis species	7	Animalia : Mollusca : Gastropoda : Lesueurillidae : Lesueurilla : *Eccyliopterus beloitensis*	460.9 - 449.5 Ma Ordovician
Ecculiomphalus undulatus species	7	Animalia : Mollusca : Gastropoda : Ophiletidae : Lytospira : *Ecculiomphalus undulatus*	460.9 - 449.5 Ma Ordovician
Clathrospira subconica species	7	Animalia : Mollusca : Gastropoda : Murchisoniina : Eotomariidae : Clathrospira : *Clathrospira subconica*	460.9 - 449.5 Ma Ordovician
Eotomaria trochoides species	7	Animalia : Mollusca : Gastropoda : Pleurotomariida : Eotomariidae : Eotomaria : *Eotomaria trochoides*	460.9 - 449.5 Ma Ordovician
Liospira sp. genus	6	Animalia : Mollusca : Gastropoda : Pleurotomariida : Eotomariidae : *Liospira*	460.9 - 449.5 Ma Ordovician
Liospira obtusa species	7	Animalia : Mollusca : Gastropoda : Pleurotomariida : Eotomariidae : Liospira : *Liospira obtusa*	460.9 - 449.5 Ma Ordovician
Pleurotomaria vitruvia species	7	Animalia : Mollusca : Gastropoda : Pleurotomariida : Eotomariidae : Liospira : *Pleurotomaria vitruvia*	460.9 - 449.5 Ma Ordovician
Hormotoma sp. genus	6	Animalia : Mollusca : Gastropoda : Murchisoniina : Hormotomidae : *Hormotoma*	460.9 - 449.5 Ma Ordovician
Murchisonia gracilis species	7	Animalia : Mollusca : Gastropoda : Pleurotomariida : Murchisoniidae : Murchisonia : *Murchisonia gracilis*	460.9 - 449.5 Ma Ordovician
Murchisonia alexandra species	7	Animalia : Mollusca : Gastropoda : Loxonematidae : Omospira : *Murchisonia alexandra*	460.9 - 449.5 Ma Ordovician
Lophospira centralis species	7	Animalia : Mollusca : Gastropoda : Lophospiridae : Eunema : *Lophospira centralis*	460.9 - 449.5 Ma Ordovician
Murchisonia helicteres species	7	Animalia : Mollusca : Gastropoda : Lophospiridae : Eunema : *Murchisonia helicteres*	460.9 - 449.5 Ma Ordovician
Lophospira sp. genus	6	Animalia : Mollusca : Gastropoda : Lophospiridae : *Lophospira*	460.9 - 449.5 Ma Ordovician
Lophospira milleri species	7	Animalia : Mollusca : Gastropoda : Lophospiridae : Lophospira : *Lophospira milleri*	460.9 - 449.5 Ma Ordovician
Lophospira obliqua species	7	Animalia : Mollusca : Gastropoda : Lophospiridae : Lophospira : *Lophospira obliqua*	460.9 - 449.5 Ma Ordovician
Murchisonia perangulata species	7	Animalia : Mollusca : Gastropoda : Lophospiridae : Lophospira : *Murchisonia perangulata*	460.9 - 449.5 Ma Ordovician
Murchisonia serrulata species	7	Animalia : Mollusca : Gastropoda : Lophospiridae : Lophospira : *Murchisonia serrulata*	460.9 - 449.5 Ma Ordovician
Murchisonia ventricosa species	7	Animalia : Mollusca : Gastropoda : Lophospiridae : Lophospira : *Murchisonia ventricosa*	460.9 - 449.5 Ma Ordovician
Trochonema sp. genus	6	Animalia : Mollusca : Gastropoda : Trochonematidae : *Trochonema*	460.9 - 449.5 Ma Ordovician
Trochonema umbilicata species	7	Animalia : Mollusca : Gastropoda : Trochonematidae : Trochonema : *Trochonema umbilicata*	460.9 - 449.5 Ma Ordovician

References

Shrock R. R., Raasch G.O. (1937) Paleontology of the disturbed Ordovician rocks near Kentland, Indiana, The American Midland Naturalist 18 4, 532-607

Westphal K.W. (1974) New fossils from the Middle Ordovician Platteville Formation of southwest Wisconsin, Journal of Paleontology 48, 79-83

Bretsky P.W., Bretsky S.S., et al (1977) Molluscan and brachiopod dominated biofacies in the Platteville Formation (Middle Ordovician), upper Mississippi Valley, Bulletin of the Geological Society of Denmark 26, 115-132

Byers C. W., Gavlin S (1979) Two contemporaneous equilibrium communities in the Ordovician of Wisconsin, Lethaia 12, 297-305

Tofel J. E., Bretsky P.W. (1987) Middle Ordovician Lophospira (Archaeogastropoda) from the Upper Mississippi Valley, Journal of Paleontology 61 4, 700-723

Wagner P. J. (2017) Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database

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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