Harpidium (Isovella) maquoketa Community, Hopkinton Fm., E Iowa. and NW Illinois (Silurian of the United States)

Where: Iowa (43.0° N, 91.0° W)

• Paleocoordinates: 26.3° S, 102.1° W (Wright 2013)

• coordinate based on political unit

• basin-level geographic resolution

When: Farmers Creek Member (Hopkinton Formation), Telychian (438.5 - 433.4 Ma)

• Known only from the Farmers Creek Member of the Hopkinton Formation of late Llandoverian (early Telychian) age.

• member-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; dolomitic, shelly/skeletal wackestone and dolomitic, shelly/skeletal packstone

• "Articulated echinoderm cups indicate that turbulent conditions not pervasive. However, brachiopod valves commonly disarticulated and winnowed skeletal rich horizons are present, suggesting that bottom currents, possibly storm generated (tempestites) were more common than in the underlying Stricklandia association. [Other indications of concentration of echinoderms by currents]. ..community occurs above stricklandiid-bearing uinits (BA 4 to BA 3-4) and below a BA 3 Pentamerus Comm...possibly indicating an intermediate position (outer BA 3 to BA 3-4 boundary)."

•

•SEP environmental call based on given description and same vol. page 807.

• "...in dolomitized skeletal wackestones (rare packstones) and skeletal debris is generally well preserved."

Collection methods: See Frest et

Primary reference: B. J. Witzke and M. E. Johnson. 1999. Silurian brachiopod and related benthic communities from carbonate platform and mound environments of Iowa and surrounding areas. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 806-840 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 25015: authorized by Michael Foote, entered by Michael Foote on 26.08.2002, edited by Pete Wagner

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Chlorophyceae
 Dasycladales - Dasycladaceae
Cyclocrinites dactioloides
Cyclocrinites dactioloides
calcareous green algae
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
cups
 Monobathrida - Marsupiocrinidae
Manticrinus sp.
Manticrinus sp. Ausich 1986 Sea lily
 Monobathrida - Eucalyptocrinitidae
Archaeocalyptocrinus nodosus, Archaeocalyptocrinus iowensis
 Monobathrida - Hapalocrinidae
Theleproktocrinus davidsoni
 Monobathrida - Carpocrinidae
Carpocrinus bodei
 Monobathrida - Patelliocrinidae
Macrostylocrinus sp.
 Diplobathrida - Dimerocrinitidae
Dimerocrinites sp.
Dimerocrinites sp. Phillips 1839 Sea lily
"Dimerocrinites (E.) sp."
 Glyptosphaeritida - Gomphocystitidae
Gomphocystites sp.
Trilobita
 Corynexochida - Illaenidae
Stenopareia sp.
Stenopareia sp. Holm 1886 trilobite
 Corynexochida - Styginidae
Scutelluidae indet.
Scutelluidae indet. Richter and Richter 1955 trilobite
 Phacopida - Cheiruridae
Cheirurus sp.
Cheirurus sp. Beyrich 1845 trilobite
 Lichida - Lichidae
Dicranopeltis sp., Arctinurus sp.
Dicranopeltis sp. Hawle and Corda 1847 trilobite
Arctinurus sp. Castelnau 1843 trilobite
Stenolaemata
 Cryptostomata -
Cryptostomata indet.
Cryptostomata indet. Vine 1884
branching forms
 Cryptostomata - Fenestellidae
Fenestellidae indet.
Rhynchonellata
 Atrypida - Atrypidae
Atrypa reticularis
Atrypa reticularis Linnaeus 1758
species name in quotes
 Athyridida - Meristellidae
? Whitfieldella sp., Meristina sp.
? Whitfieldella sp. Hall and Clarke 1893
Meristina sp. Hall 1867
 Rhynchonellida - Machaerariidae
Ferganella sp.
Ferganella sp. Nikiforova 1937
 Pentamerida - Clorindidae
Clorinda sp.
Clorinda sp. Barrande 1879
 Pentamerida - Pentameridae
Harpidium (Isovella) maquoketa
 Pentamerida - Stricklandiidae
Stricklandia laevis
 Spiriferida - Cyrtiidae
Eospirifer sp.
Eospirifer sp. Schuchert 1913
 Spiriferida - Delthyrididae
Howellella sp.
Howellella sp. Kozlowski 1946
 Orthida -
Orthida indet.
Orthida indet. Schuchert and Cooper 1932
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929
 Orthida - Rhipidomellidae
Dalejina sp.
Dalejina sp. Havlicek 1953
 Orthida - Linoporellidae
Linoporella sp.
Linoporella sp. Schuchert and Cooper 1931
 Orthida - Platystrophiidae
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820
Chileata
 Dictyonellida - Eichwaldiidae
"Dictyonella sp." = Eodictyonella
"Dictyonella sp." = Eodictyonella Wright 1994
Lingulata
 Trimerellida - Trimerellidae
Dinobolus sp.
Dinobolus sp. Hall 1871
Cephalopoda
 Discosorida - Lowoceratidae
Kayoceras sp.
Kayoceras sp. Foerste 1934
 Discosorida - Phragmoceratidae
Phragmoceras sp.
Phragmoceras sp. Broderip 1839
 Oncocerida - Acleistoceratidae
Amphicyrtoceras sp.
Amphicyrtoceras sp. Foerste 1924
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
indet. nautiloid spp.
 Orthocerida - Orthoceratidae
Michelinoceras sp.
Michelinoceras sp. Foerste 1932
 Orthocerida - Kionoceratidae
Kionoceras sp.
Kionoceras sp. Hyatt 1884
 Actinocerida - Huroniidae
Huronia sp.
Huronia sp. Stokes 1824
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
indet. gastropod spp.
 Euomphalina - Ophiletidae
Lytospira sp.
Lytospira sp. Koken 1896 snail
 Euomphalina - Platyceratidae
Cyclonema sp., Platyceras sp.
Cyclonema sp. Hall 1852 snail
Platyceras sp. Conrad 1840 snail
 Euomphalina - Euomphalidae
Straparollus spp., Poleumita sp.
Straparollus spp. de Montfort 1810 snail
Poleumita sp. Clarke and Ruedemann 1903 snail
 Murchisoniina - Loxonematidae
? Stylonema sp.
? Stylonema sp. Perner 1907 snail
 Murchisoniina -
Eotomarioidea indet.
Eotomarioidea indet. Wenz 1938 snail
 Murchisoniina - Phanerotrematidae
Phanerotrema sp.
Phanerotrema sp. Fischer 1885 snail
 Murchisoniina -
Murchisonioidea indet.
Murchisonioidea indet. Koken 1896 snail
 Murchisoniina - Murchisoniidae
Michelia sp.
Michelia sp. Roemer 1855 snail
 Murchisoniina - Subulitidae
Cyrtospira sp.
Cyrtospira sp. Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
Tremanotus sp.
Tremanotus sp. Hall 1868 snail
Bivalvia
 Myalinida - Ambonychiidae
Amphicoelia sp., "Streptomytilus sp." = Mytilarca
Amphicoelia sp. Hall 1865 clam
"Streptomytilus sp." = Mytilarca Hall and Whitfield 1869 clam
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
indet. bivalve spp.
Rostroconchia
 Conocardiida - Conocardiidae
Conocardium sp.
Conocardium sp. Bronn 1835
Anthozoa
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
solitary rugosan sp. 1
 Heliolitida - Halysitidae
Halysites sp.
Halysites sp. von Waldheim 1813 tabulate coral
 Favositida - Pachyporidae
Striatopora iowensis
Striatopora iowensis tabulate coral
 Favositida - Favositidae
Favosites sp.
Favosites sp. Lamarck 1816 tabulate coral