Pisocrinus-Gissocrinus Assoc., Hartung Quarry: Wenlock, Wisconsin

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa - Stauriida - Zaphrentidae
Zaphrentidae indet. Milne-Edwards and Haime 1850
Strophomenata - Strophomenida - Sowerbyellidae
Eoplectodonta sp. Kozlowski 1929
Strophomenata - Strophomenida - Strophodontidae
Protomegastrophia profunda (Hall 1852)
recombined as Brachyprion (Protomegastrophia) profunda
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp. Hall 1879
Rhynchonellata - Orthida - Platystrophiidae
Platystrophia biforata (Schlotheim 1820)
recombined as Platystrophia biforatus
Rhynchonellata - Orthida - Dicoelosiidae
Dicoelosia sp. King 1850
Rhynchonellata - Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
Rhynchonellata - Orthida - Dalmanellidae
Resserella sp. Bancroft 1928
Isorthis sp. Kozlowski 1929
Rhynchonellata - Atrypida - Atrypidae
Plectatrypa sp. Schuchert and Cooper 1930
Atrypa "reticularis" (Linnaeus 1758)
original and current combination Anomia reticularis
Rhynchonellata - Pentamerida - Gypidulidae
Gypidulidae informal indet. A Schuchert and Le Vene 1929
gypidulid A
Gypidulidae informal indet. B Schuchert and Le Vene 1929
gypidulid B
Rhynchonellata - Pentamerida - Clorindidae
Antirhynchonella cf. ventricosa
Rhynchonellata - Pentamerida - Camerellidae
Camerella sp. Billings 1859
Rhynchonellata - Pentamerida - Parastrophinidae
Anastrophia sp. Hall 1867
Rhynchonellata - Spiriferida - Cyrtiidae
Hedeina sp. Boucot 1957
Eospirifer sp. Schuchert 1913
unclassified
Bryozoa indet. Ehrenberg 1831
branching and crustose forms
Stenolaemata - Cryptostomata - Fenestellidae
Fenestellidae indet. King 1850
Trilobita - Phacopida - Cheiruridae
Sphaerexochus roemingeri
Crinoidea
Crinoidea indet. Miller 1821
Crinoidea - Diplobathrida - Lampterocrinidae
Siphonocrinus nobilis
Lampterocrinus inflatus
Crinoidea - Zophocrinidae
? Zophocrinus sp. Miller 1891
Crinoidea - Pisocrinida - Pisocrinidae
Pisocrinus spp.
see common names

Geography
Country:United States State/province:Wisconsin
Coordinates: 43.0° North, 87.9° West (view map)
Paleocoordinates:23.6° South, 50.9° West
Basis of coordinate:based on political unit
Geographic resolution:outcrop
Time
Period:Silurian Epoch:Wenlock
10 m.y. bin:Silurian 2
Key time interval:Wenlock
Age range of interval:433.40000 - 427.40000 m.y. ago
Stratigraphy
Formation:Racine
Stratigraphic resolution:member
Stratigraphy comments: lower-middle Racine Formation. Age range for association stated as Wenlockian-Ludlovian (which corresponds to age range of Racine). I have assigned this to Wenlockian based on other collections from lower-middle Racine [e.g. coll. 13353] treated by this reference as Wenlockian.
Lithology and environment
Primary lithology:dolomitic,shelly/skeletal argillaceous wackestone
Secondary lithology:dolomitic,shelly/skeletal argillaceous lime mudstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "occurs in skeletal-moldic dolomudstones to dolowackestones, slightly argillaceous to argillaceous"
Environment:deep subtidal ramp Tectonic setting:cratonic basin
Geology comments: "skeletal grains non-abraded but disarticulated; skeletal grains 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."
SEP environmental call based on given information and regional context
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Collection method comments: Table 45.45, which has counts for one sample from Hartung Quarry. Note that Gissocrinus is not present in this sample.
Metadata
Database number:26815
Authorizer:M. Foote Enterer:M. Foote
Modifier:S. Peters Research group:marine invertebrate
Subset of collection #:26816
Created:2002-11-04 10:47:39 Last modified:2003-05-04 12:59:15
Access level:the public Released:2002-11-04 10:47:39
Creative Commons license:CC BY
Reference information

Primary reference:

4379. 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]