BETA TEST - Fossil data and pages are very much experimental and under development. Please report any problems

Hopkinton - Farmers Creek, USA

Formation	Hopkinton
Member	Farmers Creek
Age:	439 - 433 Ma Silurian
Interval	Telychian
Tectonic Setting	Cratonic basin
Lithology	wackestone/packstone, packstone, packstone/grainstone, grainstone/packstone, dolomite
Number of Collections	9
Number of Occurrences	219

Recorded Sample Locations

Location	Region	Stratigraphic Name
St. Peter Sandstone Cephalopods	Grant County, Wisconsin, USA	Hopkinton - Farmers Creek
Atrypa 'reticularis'-Dimerocrinites	Delaware County, Iowa, USA	Hopkinton - Farmers Creek
Bolicrinus-Theleproktocrinus Assoc.	Jackson County, Iowa, USA	Hopkinton - Farmers Creek
FF	Johnson County, Iowa, USA	Hopkinton - Farmers Creek

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Blanding	441 - 433 Ma Silurian	lime mudstone/wackestone, lime mudstone/packstone, wackestone/grainstone, dolomite	56
Glenwood	461 - 450 Ma Ordovician		127
Gower	433 - 423 Ma Silurian	carbonate	9
Grand Detour	461 - 450 Ma Ordovician	limestone	147
Hopkinton	439 - 433 Ma Silurian	wackestone	55
Hopkinton - Picture Rock	439 - 433 Ma Silurian	carbonate, dolomite	19
Hopkinton - Sweeney	441 - 439 Ma Silurian	lime mudstone/packstone	11
Mifflin	461 - 450 Ma Ordovician	limestone	161
Nachusa	461 - 450 Ma Ordovician		157
Pecatonica	461 - 450 Ma Ordovician	limestone	110
Quimbys Mill	461 - 450 Ma Ordovician	limestone/dolomite, "limestone"	194
Scotch Grove - Buck Creek Quarry	433 - 427 Ma Silurian	lime mudstone/wackestone, wackestone/packstone, packstone/grainstone, dolomite	138
Scotch Grove - John Creek Quarry	443 - 433 Ma Silurian	dolomite	6
Scotch Grove - Welton	433 - 427 Ma Silurian	wackestone, wackestone/packstone, packstone/wackestone, dolomite	294
Spechts Ferry	461 - 450 Ma Ordovician	shale/"limestone", "shale"	132
St. Peter Sandstone	461 - 450 Ma Ordovician	sandstone	149
Galena - Dubuque	461 - 450 Ma Ordovician	limestone, wackestone	68
Galena - Dunleith - Beecher	461 - 450 Ma Ordovician	limestone	194
Galena - Dunleith - Eagle Point	461 - 450 Ma Ordovician	limestone	198
Galena - Dunleith - Fairplay	461 - 450 Ma Ordovician	shale/"limestone"	146
Galena - Dunleith - Mortimer	461 - 450 Ma Ordovician	limestone	156
Galena - Dunleith - Rivoli	461 - 450 Ma Ordovician	limestone	151
Galena - Dunleith - Sherwood	453 - 445 Ma Late/Upper Ordovician	limestone, wackestone	180
Galena - Dunleith - Wall	461 - 450 Ma Ordovician	limestone	168
Galena - Dunleith - Wyota	461 - 450 Ma Ordovician	limestone	159
Galena - Guttenberg	461 - 450 Ma Ordovician	limestone, "limestone"/"shale"	204
Galena - Guttenberg - Glenhaven	461 - 450 Ma Ordovician	mudstone/"shale"	16
Galena - Ion - Buckhorn	461 - 450 Ma Ordovician	limestone	203
Galena - Ion - St. James	461 - 450 Ma Ordovician	shale	180
Galena - Wise Lake - Rifle Hill	461 - 450 Ma Ordovician	dolomite	65
Galena - Wise Lake - Sinsinawa	461 - 450 Ma Ordovician	limestone	155
Maquoketa - Brainard Shale	450 - 444 Ma Paleozoic	shale	43
Maquoketa - Fort Atkinson Limestone	452 - 450 Ma Late/Upper Ordovician	dolomite, "limestone"	41
Maquoketa - Neda	450 - 444 Ma Paleozoic		17
Maquoketa - Scales Shale - Clermont	452 - 450 Ma Late/Upper Ordovician	limestone, "shale"	111
Maquoketa - Scales Shale - Elgin	450 - 444 Ma Paleozoic	limestone, wackestone	157

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Trilobita class	3	Animalia : Arthropoda : Trilobita	438.5 - 433.4 Ma Silurian
Bumastus sp. genus	6	Animalia : Arthropoda : Trilobita : Corynexochida : Illaenidae : *Bumastus*	438.5 - 433.4 Ma Silurian
Stenopareia sp. genus	6	Animalia : Arthropoda : Trilobita : Corynexochida : Illaenidae : *Stenopareia*	438.5 - 433.4 Ma Silurian
Arctinurus sp. genus	6	Animalia : Arthropoda : Trilobita : Lichida : Lichidae : *Arctinurus*	438.5 - 433.4 Ma Silurian
Dicranopeltis sp. genus	6	Animalia : Arthropoda : Trilobita : Lichida : Lichidae : *Dicranopeltis*	438.5 - 433.4 Ma Silurian
Scutelluidae family	5	Animalia : Arthropoda : Trilobita : Corynexochida : Scutelluidae	438.5 - 433.4 Ma Silurian
Calymene sp. genus	6	Animalia : Arthropoda : Trilobita : Phacopida : Calymenidae : *Calymene*	438.5 - 433.4 Ma Silurian
Cheirurus sp. genus	6	Animalia : Arthropoda : Trilobita : Phacopida : Cheiruridae : *Cheirurus*	438.5 - 433.4 Ma Silurian
Encrinuridae family	5	Animalia : Arthropoda : Trilobita : Phacopida : Encrinuridae	438.5 - 433.4 Ma Silurian
Brachiopoda phylum	2	Animalia : Brachiopoda	443.4 - 433.4 Ma Silurian
Eodictyonella sp. genus	6	Animalia : Brachiopoda : Chileata : Dictyonellida : Eichwaldiidae : *Eodictyonella*	438.5 - 433.4 Ma Silurian
Dinobolus sp. genus	6	Animalia : Brachiopoda : Craniata : Trimerellidae : *Dinobolus*	438.5 - 433.4 Ma Silurian
Coelospira sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Anoplothecidae : *Coelospira*	438.5 - 433.4 Ma Silurian
Meristina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Meristellidae : *Meristina*	438.5 - 433.4 Ma Silurian
Whitfieldella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Meristellidae : *Whitfieldella*	438.5 - 433.4 Ma Silurian
Merista sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Meristidae : *Merista*	438.5 - 433.4 Ma Silurian
Nucleospira sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Athyridida : Nucleospiridae : *Nucleospira*	438.5 - 433.4 Ma Silurian
Atrypa sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : *Atrypa*	438.5 - 433.4 Ma Silurian
Atrypa reticularis species	7	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : Atrypa : *Atrypa reticularis*	438.5 - 433.4 Ma Silurian
Plectatrypa sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : *Plectatrypa*	438.5 - 433.4 Ma Silurian
Orthida order	4	Animalia : Brachiopoda : Rhynchonellata : Orthida	438.5 - 433.4 Ma Silurian
Isorthis sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Isorthis*	438.5 - 433.4 Ma Silurian
Resserella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dalmanellidae : *Resserella*	438.5 - 433.4 Ma Silurian
Dicoelosia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Dicoelosiidae : *Dicoelosia*	438.5 - 433.4 Ma Silurian
Linoporella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Linoporellidae : *Linoporella*	438.5 - 433.4 Ma Silurian
Platystrophia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Platystrophiidae : *Platystrophia*	438.5 - 433.4 Ma Silurian
Platystrophia biforatus species	7	Animalia : Brachiopoda : Rhynchonellata : Orthida : Platystrophiidae : Platystrophia : *Platystrophia biforatus*	438.5 - 433.4 Ma Silurian
Dalejina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Orthida : Rhipidomellidae : *Dalejina*	438.5 - 433.4 Ma Silurian
Clorinda sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Clorindidae : *Clorinda*	438.5 - 433.4 Ma Silurian
Anastrophia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Parastrophinidae : *Anastrophia*	438.5 - 433.4 Ma Silurian
Harpidium (Isovella) sp. subgenus	6.3	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Pentameridae : *Harpidium (Isovella)*	438.5 - 433.4 Ma Silurian
Pentameroides subrectus species	7	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Pentameridae : Pentameroides : *Pentameroides subrectus*	438.5 - 433.4 Ma Silurian
Pentamerus oblongus species	7	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Pentameridae : Pentamerus : *Pentamerus oblongus*	443.4 - 433.4 Ma Silurian
Costistricklandia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Stricklandiidae : *Costistricklandia*	438.5 - 433.4 Ma Silurian
Stricklandia sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Stricklandiidae : *Stricklandia*	438.5 - 433.4 Ma Silurian
Rhynchonellida order	4	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida	443.4 - 433.4 Ma Silurian
Ferganella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Machaerariidae : *Ferganella*	438.5 - 433.4 Ma Silurian
Eospirifer sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Cyrtiidae : *Eospirifer*	438.5 - 433.4 Ma Silurian
Hedeina sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Cyrtiidae : *Hedeina*	443.4 - 433.4 Ma Silurian
Howellella sp. genus	6	Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Delthyrididae : *Howellella*	438.5 - 433.4 Ma Silurian
Fardenia (Coolinia) sp. subgenus	6.3	Animalia : Brachiopoda : Strophomenata : Orthotetida : Chilidiopsidae : *Fardenia (Coolinia)*	438.5 - 433.4 Ma Silurian
Triplesia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Orthotetida : Triplesiidae : *Triplesia*	438.5 - 433.4 Ma Silurian
Protomegastrophia sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Leptostrophiidae : *Protomegastrophia*	438.5 - 433.4 Ma Silurian
Leptaena sp. genus	6	Animalia : Brachiopoda : Strophomenata : Strophomenida : Rafinesquinidae : *Leptaena*	438.5 - 433.4 Ma Silurian
Leptaena rhomboidalis species	7	Animalia : Brachiopoda : Strophomenata : Strophomenida : Rafinesquinidae : Leptaena : *Leptaena rhomboidalis*	443.4 - 433.4 Ma Silurian
Bryozoa phylum	2	Animalia : Bryozoa	443.4 - 433.4 Ma Silurian
Cryptostomata order	4	Animalia : Bryozoa : Stenolaemata : Cryptostomata	438.5 - 433.4 Ma Silurian
Fenestellidae family	5	Animalia : Bryozoa : Stenolaemata : Fenestrida : Fenestellidae	438.5 - 433.4 Ma Silurian
Paltodus equicostatus species	7	Animalia : Chordata : Distacodontidae : Panderodus : *Paltodus equicostatus*	443.4 - 433.4 Ma Silurian
Anthozoa class	3	Animalia : Cnidaria : Anthozoa	443.4 - 433.4 Ma Silurian
Rugosa subclass	3.3	Animalia : Cnidaria : Anthozoa : Rugosa	438.5 - 433.4 Ma Silurian
Favosites sp. genus	6	Animalia : Cnidaria : Anthozoa : Favositidae : *Favosites*	438.5 - 433.4 Ma Silurian
Striatopora sp. genus	6	Animalia : Cnidaria : Anthozoa : Pachyporidae : *Striatopora*	438.5 - 433.4 Ma Silurian
Halysites sp. genus	6	Animalia : Cnidaria : Anthozoa : Favositidae : *Halysites*	438.5 - 433.4 Ma Silurian
Heliolites sp. genus	6	Animalia : Cnidaria : Anthozoa : Heliolitidae : *Heliolites*	438.5 - 433.4 Ma Silurian
Camerata subclass	3.3	Animalia : Echinodermata : Crinoidea : Camerata	443.4 - 433.4 Ma Silurian
Crinoidea class	3	Animalia : Echinodermata : Crinoidea	438.5 - 433.4 Ma Silurian
Crotalocrinites sp. genus	6	Animalia : Echinodermata : Crinoidea : Crotalocrinitidae : *Crotalocrinites*	438.5 - 433.4 Ma Silurian
Cyathocrinites sp. genus	6	Animalia : Echinodermata : Crinoidea : Cyathocrinitidae : *Cyathocrinites*	438.5 - 433.4 Ma Silurian
Dimerocrinites sp. genus	6	Animalia : Echinodermata : Crinoidea : Dimerocrinitidae : *Dimerocrinites*	438.5 - 433.4 Ma Silurian
Lampterocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : Lampterocrinidae : *Lampterocrinus*	443.4 - 433.4 Ma Silurian
Carpocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : Carpocrinidae : *Carpocrinus*	438.5 - 433.4 Ma Silurian
Marsupiocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : Marsupiocrinidae : *Marsupiocrinus*	443.4 - 433.4 Ma Silurian
Allocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Allocrinus*	438.5 - 433.4 Ma Silurian
Archaeocalyptocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Archaeocalyptocrinus*	438.5 - 433.4 Ma Silurian
Bolicrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Bolicrinus*	438.5 - 433.4 Ma Silurian
Cytocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Cytocrinus*	438.5 - 433.4 Ma Silurian
Krinocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Krinocrinus*	443.4 - 433.4 Ma Silurian
Manticrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Manticrinus*	438.5 - 433.4 Ma Silurian
Theleproktocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Theleproktocrinus*	438.5 - 433.4 Ma Silurian
Thomasocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Thomasocrinus*	438.5 - 433.4 Ma Silurian
Macrostylocrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : Patelliocrinidae : *Macrostylocrinus*	438.5 - 433.4 Ma Silurian
Manicrinus sp. genus	6	Animalia : Echinodermata : Crinoidea : *Manicrinus*	438.5 - 433.4 Ma Silurian
Gomphocystites sp. genus	6	Animalia : Echinodermata : Diploporita : Gomphocystitidae : *Gomphocystites*	438.5 - 433.4 Ma Silurian
Caryocrinites sp. genus	6	Animalia : Echinodermata : Rhombifera : Caryocrinitidae : *Caryocrinites*	443.4 - 433.4 Ma Silurian
Callocystitidae family	5	Animalia : Echinodermata : Rhombifera : Callocystitidae	438.5 - 433.4 Ma Silurian
Bivalvia class	3	Animalia : Mollusca : Bivalvia	438.5 - 433.4 Ma Silurian
Megalomoidea sp. genus	6	Animalia : Mollusca : Bivalvia : Hippuritida : Lyrodesmatidae : *Megalomoidea*	438.5 - 433.4 Ma Silurian
Amphicoelia sp. genus	6	Animalia : Mollusca : Bivalvia : Myalinida : Ambonychiidae : *Amphicoelia*	438.5 - 433.4 Ma Silurian
Mytilarca sp. genus	6	Animalia : Mollusca : Bivalvia : Myalinida : Ambonychiidae : *Mytilarca*	438.5 - 433.4 Ma Silurian
Nautiloidea subclass	3.3	Animalia : Mollusca : Cephalopoda : Nautiloidea	438.5 - 433.4 Ma Silurian
Huronia sp. genus	6	Animalia : Mollusca : Cephalopoda : Huroniidae : *Huronia*	438.5 - 433.4 Ma Silurian
Discosorus sp. genus	6	Animalia : Mollusca : Cephalopoda : Nautilida : Nautilidae : *Discosorus*	438.5 - 433.4 Ma Silurian
Kayoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Lowoceratidae : *Kayoceras*	438.5 - 433.4 Ma Silurian
Phragmoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Phragmoceratidae : *Phragmoceras*	438.5 - 433.4 Ma Silurian
Amphicyrtoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Acleistoceratidae : *Amphicyrtoceras*	438.5 - 433.4 Ma Silurian
Dawsonoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Nautilida : Nautilidae : *Dawsonoceras*	438.5 - 433.4 Ma Silurian
Kionoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Orthoceratidae : *Kionoceras*	438.5 - 433.4 Ma Silurian
Michelinoceras sp. genus	6	Animalia : Mollusca : Cephalopoda : Orthoceratidae : *Michelinoceras*	438.5 - 433.4 Ma Silurian
Gastropoda class	3	Animalia : Mollusca : Gastropoda	438.5 - 433.4 Ma Silurian
Tremanotus sp. genus	6	Animalia : Mollusca : Gastropoda : Bellerophontida : Bucaniidae : *Tremanotus*	438.5 - 433.4 Ma Silurian
Poleumita sp. genus	6	Animalia : Mollusca : Gastropoda : Euomphalidae : *Poleumita*	438.5 - 433.4 Ma Silurian
Straparollus sp. genus	6	Animalia : Mollusca : Gastropoda : Euomphalidae : *Straparollus*	438.5 - 433.4 Ma Silurian
Lytospira sp. genus	6	Animalia : Mollusca : Gastropoda : Ophiletidae : *Lytospira*	438.5 - 433.4 Ma Silurian
Cyclonema sp. genus	6	Animalia : Mollusca : Gastropoda : Platyceratidae : *Cyclonema*	438.5 - 433.4 Ma Silurian
Platyceras sp. genus	6	Animalia : Mollusca : Gastropoda : Platyceratidae : *Platyceras*	438.5 - 433.4 Ma Silurian
Eotomarioidea superfamily	4.7	Animalia : Mollusca : Gastropoda : Murchisoniina : Eotomarioidea	438.5 - 433.4 Ma Silurian
Murchisonioidea superfamily	4.7	Animalia : Mollusca : Gastropoda : Murchisoniina : Murchisonioidea	438.5 - 433.4 Ma Silurian
Stylonema sp. genus	6	Animalia : Mollusca : Gastropoda : Loxonematidae : *Stylonema*	438.5 - 433.4 Ma Silurian
Michelia sp. genus	6	Animalia : Mollusca : Gastropoda : Pleurotomariida : Sinuspiridae : *Michelia*	438.5 - 433.4 Ma Silurian
Phanerotrema sp. genus	6	Animalia : Mollusca : Gastropoda : Pleurotomariida : Phanerotrematidae : *Phanerotrema*	438.5 - 433.4 Ma Silurian
Cyrtospira sp. genus	6	Animalia : Mollusca : Gastropoda : Littorinimorpha : Calyptraeidae : *Cyrtospira*	438.5 - 433.4 Ma Silurian
Rostroconchia class	3	Animalia : Mollusca : Rostroconchia	438.5 - 433.4 Ma Silurian
Conocardium sp. genus	6	Animalia : Mollusca : Rostroconchia : *Conocardium*	438.5 - 433.4 Ma Silurian
Cyclocrinites sp. genus	6	Plantae : Chlorophyta : Ulvophyceae : Dasycladales : Dasycladaceae : *Cyclocrinites*	438.5 - 433.4 Ma Silurian

References

Witzke B. J., Johnson M. E. (1999) Silurian brachiopod and related benthic communities from carbonate platform and mound environments of Iowa and surrounding areas, Paleocommunities--a case study from the Silurian and Lower Devonian, 806-840

Frest T. J., Brett C. E., et al (1999) Caradocian-Gedinnian echinoderm associations of Central and Eastern North America, Paleocommunities--a case study from the Silurian and Lower Devonian, 638-783

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

McAdams N. E. B., Bancroft A. M., et al (2017) Integrated carbon isotope and conodont biochemostratigraphy of the Silurian (Aeronian–Telychian) of the East-Central Iowa Basin, Iowa, USA, Newsletters on Stratigraphy doi:10.1127/nos/2017/0375

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!

Quick NavTop Recorded Sample Locations Associated Units Recorded Fossils References