Pisocrinus-Gissocrinus Assoc., SE Wisconsin, NE Illinois, and N Indiana (Silurian to of the United States)

Where: Illinois (43.0° N, 88.0° W)

• Paleocoordinates: 26.4° S, 85.2° W (Wright 2013)

• coordinate estimated from map

• basin-level geographic resolution

When: Wenlock to Wenlock (432.9 - 422.7 Ma)

• Portions of Joliet Fm., Sugar Run Fm., lower-middle Racine Fm., and Wabash Fm.

Environment/lithology: deep subtidal; dolomitic, shelly/skeletal, argillaceous wackestone and dolomitic, shelly/skeletal, argillaceous lime mudstone

• "skeletal grains non-abraded bu disarticulated; skeletal grons from <1-20% of total seidment volume...winnowed debris patches occur, but are rare and small; rare storm rup-up conglomerates; [generally] no evidence of vigorous bottom currents, and aposition well below fairweather wavebase, probably at or below normal storm wavebase, in generall quiet water settings is indicated...significant ichofauna..carbonaceous material...pyrite...The P.-G. Assoc. occupies a quiet water, intermound position within the Racine and Wabash Formations, indicating a depth below BA 3 mounds; a BA 4 psotion is preferred. The abundance of clorindids (Antichynchonella) and Dicoelosia plus some Skenidioides further suggests that the assoc. may range into BA 5."
• "occurs in skeletal-moldic dolomudstones to dolowackestones, slightly argillaceous to argillaceous"

Collection methods: I have included taxa from table 45.45 as well as others mentioned in text.

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26816: authorized by Michael Foote, entered by Michael Foote on 04.11.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

unclassified
  -
Pterobranchia
 Graptoloidea - Monograptidae
Monograptidae indet. Lapworth 1873 graptolite
 Dendroidea -
Dendroidea indet. Nicholson 1872 graptolite
Stylophora
 Mitrata -
? Mitrata indet. Jaekel 1918
"A possible mitrate was briefly seen (Witzke) in a private collection from the type locality."
Blastoidea
  -
Blastoidea indet. Say 1825 blastoid
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
 Sagenocrinida - Nipterocrinidae
 Sagenocrinida - Lecanocrinidae
 Cyathocrinida - Cyathocrinitidae
Gissocrinus sp. Angelin 1878 Sea lily
 Cyathocrinida - Thalamocrinidae
Thalamocrinus sp. Miller and Gurley 1895 Sea lily
 Belemnocrinoidea - Zophocrinidae
? Zophocrinus sp. Miller 1891 Sea lily
 Myelodactylida - Myelodactylidae
Myelodactylus sp. Hall 1852 Sea lily
 Pisocrinida - Pisocrinidae
Parapisocrinus sp. Mu 1954 Sea lily
Pisocrinus sp. de Koninck 1858 Sea lily
 Diplobathrida - Lampterocrinidae
 Monobathrida - Hapalocrinidae
Hapalocrinidae indet. Jaekel 1895 Sea lily
 Monobathrida - Hirneacrinidae
Hirneacrinidae indet. Frest and Strimple 1977 Sea lily
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Artiopoda
 Phacopida - Calymenidae
"Sthenarocalymene celebra" = Calymene celebra
"Sthenarocalymene celebra" = Calymene celebra Raymond 1916 trilobite
 Phacopida - Encrinuridae
Encrinuridae indet. Angelin 1854 trilobite
 Phacopida - Cheiruridae
Cheiruridae indet. Hawle and Corda 1847 trilobite
 Phacopida - Dalmanitidae
Dalmanites sp. Barrande 1852 trilobite
Lecathylus
  -
Lecathylus sp. Weller 1925
The genus is variably spelled "Lecthyalus" and "Lecthaylus" in this reference, but the correct form is "Lecathylus" according to Treatise on Invertebrate Paleontology, volume W.
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
branching and crustose forms
Stenolaemata
 Cryptostomata - Fenestellidae
Chileata
 Dictyonellida - Eichwaldiidae
"Dictyonella sp." = Eodictyonella
"Dictyonella sp." = Eodictyonella Wright 1994
Rhynchonellata
 Spiriferida - Cyrtiidae
Eospirifer sp. Schuchert 1913
Striispirifer sp. Cooper and Muir-Wood 1951
Hedeina sp. Boucot 1957
Cyrtia sp. Dalman 1828
 Atrypida - Atrypidae
Atrypa "reticularis" Linnaeus 1758
Plectatrypa sp. Schuchert and Cooper 1930
 Pentamerida - Clorindidae
 Pentamerida - Gypidulidae
Gypidulidae "indet. A" Schuchert and Le Vene 1929
gypidulid A
Gypidulidae "indet. B" Schuchert and Le Vene 1929
gypidulid B
 Pentamerida - Camerellidae
Camerella sp. Billings 1859
 Pentamerida - Parastrophinidae
Anastrophia sp. Hall 1867
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp. Hall 1879
 Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Resserella sp. Bancroft 1928
 Orthida - Dicoelosiidae
Dicoelosia sp. King 1850
 Orthida - Platystrophiidae
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820
 Athyridida - Meristellidae
Meristina sp. Hall 1867
Strophomenata
 Strophomenida - Sowerbyellidae
Eoplectodonta sp. Kozlowski 1929
 Strophomenida - Leptestiidae
Leangella sp. Opik 1933
 Strophomenida - Strophodontidae
"Protomegastrophia profunda" = Brachyprion (Protomegastrophia) profunda
"Protomegastrophia profunda" = Brachyprion (Protomegastrophia) profunda Hall 1852
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Rostroconchia
 Conocardiida - Conocardiidae
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail
Heteractinida
 Octactinellida - Astraeospongiidae
Astraeospongium sp. Roemer 1860
Anthozoa
 Tabulata -
Tabulata indet. tabulate coral
 Auloporida - Auloporidae
Auloporidae indet. Milne-Edwards and Haime 1850 tabulate coral
 Rugosa -
Rugosa indet. horn coral
 Stauriida - Zaphrentidae
Zaphrentidae indet. Milne-Edwards and Haime 1850 horn coral