Apiocystitinid Association, Llandovery, E Iowa and NW Illinois: Rhuddanian, Illinois

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Apiocystitidae indet.
Anthozoa - Favositida - Favositidae
Favosites sp. Lamarck 1816
Anthozoa - Auloporida - Syringoporidae
Syringopora sp. Goldfuss 1826
Anthozoa - Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813
Anthozoa - Rugosa
Rugosa indet. Milne-Edwards and Haime 1850
Heteractinida - Octactinellida - Astraeospongiidae
Astraeospongium sp. (Roemer 1860)
Stromatoporoidea - Stromatoporoidea
Stromatoporoidea indet. Nicholson and Murie 1878
Crinoidea
Disparida indet. Moore and Laudon 1943
micro form
Crinoidea - Calceocrinida - Calceocrinidae
? Eohalysiocrinus sp. Prokop 1970
Calceocrinus sp. Hall 1852
Crinoidea - Myelodactylida - Myelodactylidae
? Myelodactylus sp. Hall 1852
Crinoidea
? Kanabinocrinus sp. Ausich 1986
Echinoidea - Bothriocidaroida
Bothriocidaroida indet. von Zittel 1879
Stylophora - Mitrata
Mitrata indet. Jaekel 1918
Cyclocystoidea - Cyclocystoididae
Sievertsia sp. Smith and Paul 1982
unclassified
Bryozoa indet. Ehrenberg 1831
Rhynchonellata - Atrypida - Atrypidae
Plectatrypa sp. Schuchert and Cooper 1930
Rhynchonellata - Orthida - Dalmanellidae
Dalmanellidae indet. Schuchert 1913
Rhynchonellata - Orthida - Hesperorthidae
Hesperorthis sp. Schuchert and Cooper 1931
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Bivalvia
Pelecypoda indet. Goldfuss 1820
synonym of Bivalvia
Gastropoda
Gastropoda indet. Cuvier 1795
Gastropoda - Euomphalina - Platyceratidae
Platyceras sp. Conrad 1840
Trilobita - Corynexochida - Illaenidae
Stenopareia sp. Holm 1886
Trilobita - Phacopida - Encrinuridae
Encrinuridae indet. Angelin 1854
see common names

Geography
Country:United States State/province:Illinois
Coordinates: 42.5° North, 90.2° West (view map)
Paleocoordinates:19.7° South, 57.3° West
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period:Silurian Epoch:Llandovery
Stage:Rhuddanian 10 m.y. bin:Silurian 1
Key time interval:Rhuddanian
Age range of interval:443.80000 - 440.80000 m.y. ago
Stratigraphy
Stratigraphy comments: "Early Llandovery (A), according to Johnson (1980) and Witzke (1983); could range as high as early B. The as yet poorly knownb fauna is not strongly diagnostic, but its position in the Iowa-Illinois section suggetss late A to early B." "Type locality is just about the Silurian-Ordovican (Maquoketa Group) contact, Tete des Morts Formation."
Lithology and environment
Primary lithology:bioturbation,dolomitic,shelly/skeletal wackestone
Includes fossils?Y
Lithology description: "Some horizons are noticeably burrowed, others winnowd...The rock is a thick-bedded, fine to medium grained vuggy dolomite with some minor chert; the dominant fabric is dolimite- or incompletely silica-replaced echinodermal dolowackestone."
Environment:open shallow subtidal Tectonic setting:cratonic basin
Geology comments: Associated with coral-algae communitiy, interpreted as BA 2.
SEP environmental call based on given information and regional context
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Database number:26692
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-10-24 09:10:30 Last modified:2010-01-18 08:31:12
Access level:the public Released:2002-10-24 09:10:30
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]