Calliocrinus longispinus-Eucalyptocrinites cf. ornatus Assoc., Eastern Iowa (Silurian of the United States)

Where: Iowa (42.0° N, 90.5° W: paleocoordinates 23.3° S, 53.2° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Welton Member (Scotch Grove Formation), Wenlock (433.4 - 427.4 Ma)

• middle Welton Member, Scotch Grove Formation

• member-level stratigraphic resolution

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

• "Echinoderm thecae very abundant, forming a true thicket flanking or surrounding a central lime mud mound core...Skeletal debris poorly sorted...moderately high dominance moderate diversity BA 3 community, thus far usually associated with mounds."

•

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

• "The most common lithology is a horizontally bedded, noncherty porous, fine-grained echinoderm-moldic dolowackestone, but some packstones are present. Weakly graded bedding is present, as well as uncommon crossbeds, i.e. some evidence of wave activity is present, but the Ferganella Community [associated with this] generally occurred below normal wave base....The comm. probably occupies a middle BA 3 to shallow 4 position."

Collection methods: Some overlap with PBDB collections 24968 and 24969 (Ferganella Community). The brachiopods of this Association belong to the Ferganella Community. Abundances given for echinoderms and selected brachiopods (table 45.19).

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 26702: authorized by Michael Foote, entered by Michael Foote on 24.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Crinoidea
 Diplobathrida - Dimerocrinitidae
Dimerocrinites (Dimerocrinites) sculptus
 Diplobathrida - Lampterocrinidae
Siphonocrinus nobilis
 Monobathrida - Periechocrinidae
Periechocrinus "sp. B Witzke and Strimple"
 Monobathrida - Marsupiocrinidae
Marsupiocrinus (Amarsupiocrinus) primaevus
 Monobathrida - Dolatocrinidae
Allocrinus ornatus
 Monobathrida - Eucalyptocrinitidae
Calliocrinus longispinus, Eucalyptocrinites cf. ornatus, Eucalyptocrinites sp.
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Caryocrinites "sp. B Witzke 1976"
Gastropoda
 Euomphalina - Platyceratidae
Platyceras sp.
Platyceras sp. Conrad 1840 snail
 Euomphalina - Euomphalidae
Straparollus sp.
Straparollus sp. de Montfort 1810 snail
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Rhynchonellata
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929
 Orthida - Platystrophiidae
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820
 Spiriferida - Cyrtiidae
"Cyrtia exporrecta" = Cyrtia exporrectus, Eospirifer sp., Hedeina sp.
"Cyrtia exporrecta" = Cyrtia exporrectus Wahlenberg 1818
Eospirifer sp. Schuchert 1913
Hedeina sp. Boucot 1957
 Atrypida - Atrypidae
Plectatrypa sp., Atrypa "reticularis"
Plectatrypa sp. Schuchert and Cooper 1930
Atrypa "reticularis" Linnaeus 1758
 Atrypida - Septatrypidae
Atrypoidea sp.
Atrypoidea sp. Mitchell and Dun 1920
 Rhynchonellida - Machaerariidae
Ferganella sp.
Ferganella sp. Nikiforova 1937
 Pentamerida - Camerellidae
Camerella sp.
Camerella sp. Billings 1859
Chileata
 Dictyonellida - Eichwaldiidae
"Dictyonella sp." = Eodictyonella
"Dictyonella sp." = Eodictyonella Wright 1994
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena rhomboidalis
Leptaena rhomboidalis Wahlenberg 1818
Trilobita
 Phacopida - Calymenidae
Calymene sp.
Calymene sp. Brongniart 1822 trilobite
 Corynexochida - Illaenidae
Stenopareia sp., Bumastus sp.
Stenopareia sp. Holm 1886 trilobite
Bumastus sp. Murchison 1839 trilobite