Harpidium (Isovella) maquoketa Community, Hopkinton Fm., E Iowa. and NW Illinois: Telychian, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chlorophyceae - Dasycladales - Dasycladaceae
Cyclocrinites dactioloides
calcareous green algae
Trilobita - Lichida - Lichidae
Dicranopeltis sp. Hawle and Corda 1847
Arctinurus sp. Castelnau 1843
Trilobita - Phacopida - Cheiruridae
Cheirurus sp. Beyrich 1845
Trilobita - Corynexochida - Illaenidae
Stenopareia sp. Holm 1886
Trilobita - Corynexochida - Styginidae
Scutelluidae indet. Richter and Richter 1955
invalid subgroup of Styginidae
Rostroconchia - Conocardiida - Conocardiidae
Conocardium sp. Bronn 1835
Gastropoda
Gastropoda indet. Cuvier 1795
indet. gastropod spp.
Gastropoda - Murchisoniina
    = Murchisonioidea indet. Koken 1896
Wagner 2023
Gastropoda - Murchisoniina - Murchisoniidae
Michelia sp. Roemer 1855
Gastropoda - Murchisoniina
Eotomaria sp. Ulrich and Scofield 1897
    = Eotomarioidea indet. Wenz 1938
Wagner 2023
Gastropoda - Murchisoniina - Phanerotrematidae
Phanerotrema sp. Fischer 1885
Gastropoda - Murchisoniina - Subulitidae
Cyrtospira sp. Ulrich and Scofield 1897
Gastropoda - Murchisoniina - Loxonematidae
? Stylonema sp. Perner 1907
Gastropoda - Euomphalina - Platyceratidae
Cyclonema sp. Hall 1852
Platyceras sp. Conrad 1840
Gastropoda - Euomphalina - Ophiletidae
Lytospira sp. Koken 1896
Gastropoda - Euomphalina - Euomphalidae
Straparollus spp.
Gastropoda - Bellerophontida - Bucaniidae
Tremanotus sp. (Hall 1868)
Bivalvia
Pelecypoda indet. Goldfuss 1820
synonym of Bivalvia
indet. bivalve spp.
Bivalvia - Myalinida - Ambonychiidae
Streptomytilus sp. Kindle and Breger 1904
synonym of Mytilarca
Amphicoelia sp. Hall 1865
Cephalopoda
Nautiloidea indet. Agassiz 1847
indet. nautiloid spp.
Cephalopoda - Discosorida - Lowoceratidae
Kayoceras sp. Foerste 1934
Cephalopoda - Discosorida - Phragmoceratidae
Phragmoceras sp. Broderip 1839
Cephalopoda - Oncocerida - Acleistoceratidae
Amphicyrtoceras sp. Foerste 1924
Cephalopoda - Actinocerida - Huroniidae
Huronia sp. Stokes 1824
Cephalopoda - Orthocerida - Orthoceratidae
Michelinoceras sp. Foerste 1932
Cephalopoda - Orthocerida - Kionoceratidae
Kionoceras sp. Hyatt 1884
Craniata - Trimerellida - Trimerellidae
Dinobolus sp. Hall 1871
Rhynchonellata - Atrypida - Atrypidae
Atrypa reticularis (Linnaeus 1758)
original and current combination Anomia reticularis
species name in quotes
Rhynchonellata - Spiriferida - Cyrtiidae
Eospirifer sp. Schuchert 1913
Rhynchonellata - Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
Rhynchonellata - Rhynchonellida - Machaerariidae
Ferganella sp. Nikiforova 1937
Rhynchonellata - Orthida
Orthida indet. Schuchert and Cooper 1932
Rhynchonellata - Orthida - Platystrophiidae
Platystrophia biforata (Schlotheim 1820)
recombined as Platystrophia biforatus
Rhynchonellata - Orthida - Linoporellidae
Linoporella sp. Schuchert and Cooper 1931
Rhynchonellata - Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Rhynchonellata - Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
Rhynchonellata - Pentamerida - Clorindidae
Clorinda sp. Barrande 1879
Rhynchonellata - Pentamerida - Pentameridae
Harpidium (Isovella) maquoketa
Rhynchonellata - Pentamerida - Stricklandiidae
Stricklandia laevis
Rhynchonellata - Athyridida - Meristellidae
? Whitfieldella sp. Hall and Clarke 1893
Meristina sp. Hall 1867
Chileata - Dictyonellida - Eichwaldiidae
Dictyonella sp. Hall 1868
replaced by Eodictyonella
Stenolaemata - Cryptostomata
Cryptostomata indet. Vine 1884
branching forms
Stenolaemata - Cryptostomata - Fenestellidae
Fenestellidae indet. King 1850
Glyptosphaeritida - Gomphocystitidae
Gomphocystites sp. Hall 1864
Crinoidea
Crinoidea indet. Miller 1821
cups
Crinoidea - Diplobathrida - Dimerocrinitidae
Dimerocrinites sp. Phillips 1839
"Dimerocrinites (E.) sp."
Crinoidea - Monobathrida - Eucalyptocrinitidae
Archaeocalyptocrinus nodosus
Archaeocalyptocrinus iowensis
Crinoidea - Monobathrida - Patelliocrinidae
Macrostylocrinus sp.
Crinoidea - Monobathrida - Hapalocrinidae
Theleproktocrinus davidsoni
Crinoidea - Monobathrida - Marsupiocrinidae
Manticrinus sp. Ausich 1986
Crinoidea - Monobathrida - Carpocrinidae
Carpocrinus bodei
Anthozoa - Rugosa
Rugosa indet. Milne-Edwards and Haime 1850
solitary rugosan sp. 1
Anthozoa - Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813
Anthozoa - Favositida - Pachyporidae
Striatopora iowensis
Anthozoa - Favositida - Favositidae
Favosites sp. Lamarck 1816
see common names

Geography
Country:United States State/province:Iowa
Coordinates: 43.0° North, 91.0° West (view map)
Paleocoordinates:20.3° South, 55.3° West
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period:Silurian Epoch:Llandovery
Stage:Telychian 10 m.y. bin:Silurian 1
*International age/stage:Early/Lower Telychian
Key time interval:Telychian
Age range of interval:438.50000 - 433.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Hopkinton Member:Farmers Creek
Stratigraphic resolution:member
Stratigraphy comments: Known only from the Farmers Creek Member of the Hopkinton Formation of late Llandoverian (early Telychian) age.
Lithology and environment
Primary lithology:dolomitic,shelly/skeletal wackestone
Secondary lithology:dolomitic,shelly/skeletal packstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "...in dolomitized skeletal wackestones (rare packstones) and skeletal debris is generally well preserved."
Environment:deep subtidal ramp Tectonic setting:cratonic basin
Glacial or sequence phase:transgressive systems tract
Geology comments: "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.
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Collection method comments: See Frest et
Metadata
Database number:25015
Authorizer:M. Foote, P. Wagner Enterer:M. Foote, P. Wagner
Modifier:M. Foote Research group:marine invertebrate
Created:2002-08-26 06:42:37 Last modified:2006-09-15 15:14:05
Access level:the public Released:2002-08-26 06:42:37
Creative Commons license:CC BY
Reference information

Primary reference:
7006. 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]

Secondary references:

9042 P. J. Wagner. 2023. Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database (2006 - 2023). [P. Wagner/P. Wagner/P. Wagner]