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Hopkinton Dolomite, USA

Formation	Hopkinton Dolomite
Age:	443 - 433 Ma Silurian
Interval	Llandovery
Tectonic Setting	Cratonic basin
Lithology	dolomite
Number of Collections	5
Number of Occurrences	52

Recorded Sample Locations

Location	Region	Stratigraphic Name
Stricklandiid community		Hopkinton Dolomite
Pentamerid community	Jackson County, Iowa, USA	Hopkinton Dolomite
Trilobites of bryozoan-rich bioherm flank beds	Jones County, Iowa, USA	Hopkinton Dolomite
Trilobites of bryozoan-rich bioherm flank beds	Clinton County, Iowa, USA	Hopkinton Dolomite

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Algae informal	98	Algae	443.4 - 433.4 Ma Silurian
Leperditia sp. genus	6	Animalia : Arthropoda : Ostracoda : Leperditiidae : *Leperditia*	443.4 - 433.4 Ma Silurian
Otarion sp. genus	6	Animalia : Arthropoda : Trilobita : Proetida : Aulacopleuridae : *Otarion*	443.4 - 433.4 Ma Silurian
Stenopareia sp. genus	6	Animalia : Arthropoda : Trilobita : Corynexochida : Illaenidae : *Stenopareia*	443.4 - 433.4 Ma Silurian
Arctinurus sp. genus	6	Animalia : Arthropoda : Trilobita : Lichida : Lichidae : *Arctinurus*	443.4 - 433.4 Ma Silurian
Dicranopeltis sp. genus	6	Animalia : Arthropoda : Trilobita : Lichida : Lichidae : *Dicranopeltis*	443.4 - 433.4 Ma Silurian
Scutelluidae family	5	Animalia : Arthropoda : Trilobita : Corynexochida : Scutelluidae	443.4 - 433.4 Ma Silurian
Acidaspis sp. genus	6	Animalia : Arthropoda : Trilobita : Lichida : Odontopleuridae : *Acidaspis*	443.4 - 433.4 Ma Silurian
Ceratocephala sp. genus	6	Animalia : Arthropoda : Trilobita : Lichida : Odontopleuridae : *Ceratocephala*	443.4 - 433.4 Ma Silurian
Dudleyaspis sp. genus	6	Animalia : Arthropoda : Trilobita : Lichida : Selenopeltidae : *Dudleyaspis*	443.4 - 433.4 Ma Silurian
Calymene sp. genus	6	Animalia : Arthropoda : Trilobita : Phacopida : Calymenidae : *Calymene*	443.4 - 433.4 Ma Silurian
Cheirurus sp. genus	6	Animalia : Arthropoda : Trilobita : Phacopida : Cheiruridae : *Cheirurus*	443.4 - 433.4 Ma Silurian
Deiphon sp. genus	6	Animalia : Arthropoda : Trilobita : Phacopida : Cheiruridae : *Deiphon*	443.4 - 433.4 Ma Silurian
Proetidae family	5	Animalia : Arthropoda : Trilobita : Proetida : Proetidae	443.4 - 433.4 Ma Silurian
Whitfieldella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Meristellidae : *Whitfieldella*	443.4 - 433.4 Ma Silurian
Atrypa sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : *Atrypa*	443.4 - 433.4 Ma Silurian
Isorthis sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Isorthis*	443.4 - 433.4 Ma Silurian
Platystrophia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Platystrophiidae : *Platystrophia*	443.4 - 433.4 Ma Silurian
Pentameroides sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Pentameridae : *Pentameroides*	443.4 - 433.4 Ma Silurian
Costistricklandia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Stricklandiidae : *Costistricklandia*	443.4 - 433.4 Ma Silurian
Stricklandia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Stricklandiidae : *Stricklandia*	443.4 - 433.4 Ma Silurian
Fardenia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Orthotetida : Chilidiopsidae : *Fardenia*	443.4 - 433.4 Ma Silurian
Leptaena sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Rafinesquinidae : *Leptaena*	443.4 - 433.4 Ma Silurian
Bryozoa phylum	2	Animalia : Bryozoa	443.4 - 433.4 Ma Silurian
Rugosa subclass	3.3	Animalia : Cnidaria : Anthozoa : Rugosa	443.4 - 433.4 Ma Silurian
Syringopora sp. genus	6	Animalia : Cnidaria : Anthozoa : Favositidae : *Syringopora*	443.4 - 433.4 Ma Silurian
Favosites sp. genus	6	Animalia : Cnidaria : Anthozoa : Favositidae : *Favosites*	443.4 - 433.4 Ma Silurian
Halysites sp. genus	6	Animalia : Cnidaria : Anthozoa : Favositidae : *Halysites*	443.4 - 433.4 Ma Silurian
Crinoidea class	3	Animalia : Echinodermata : Crinoidea	443.4 - 433.4 Ma Silurian
Petalocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Petalocrinus*	443.4 - 433.4 Ma Silurian
Dimerocrinites sp. genus	6	Animalia : Echinodermata : Crinoidea : Dimerocrinitidae : *Dimerocrinites*	443.4 - 433.4 Ma Silurian
Eucalyptocrinitidae family	5	Animalia : Echinodermata : Crinoidea : Eucalyptocrinitidae	443.4 - 433.4 Ma Silurian
Macrostylocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : Patelliocrinidae : *Macrostylocrinus*	443.4 - 433.4 Ma Silurian
Cyclonema sp. genus	6	Animalia : Mollusca : Gastropoda : Platyceratidae : *Cyclonema*	443.4 - 433.4 Ma Silurian
Murchisonioidea superfamily	4.7	Animalia : Mollusca : Gastropoda : Murchisoniina : Murchisonioidea	443.4 - 433.4 Ma Silurian

References

Johnson M. E. (1980) Paleoecological structure in early Silurian platform seas of the North American midcontinent, Palaeogeography, Palaeoclimatology, Palaeoecology 30, 191-215 doi:10.1016/0031-0182(80)90056-5

Mikulic D. G. (1981) Trilobites in Paleozoic carbonate buildups, Lethaia 14 1, 45-56

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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