Ferganella Community, Massilon, Iowa. (Silurian of the United States)

Also known as Dimerocrinites (D.) sculptus Association

Where: Iowa (41.9° N, 90.9° W)

• Paleocoordinates: 27.3° S, 102.5° W (Wright 2013)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Welton Member (Scotch Grove Formation), Telychian (438.5 - 433.4 Ma)

• Welton Member, approximate middle part of Scotch Grove Formation.

• member-level stratigraphic resolution

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

• "..grains generally unabraded..brachiopods [and crinoid cups] commonly articulated..suggest quiet setting below normal wave base...some evidecne for periodic bottom disturbance by storms...slightly shallower than Costistricklandia-Eospirifer community...above BA 4 communities in the lower Welton and below BA 3 Pentameroides comm. inn the middle Scotch Grove...stratigraphic position suggests BA 3 to inner BA 4..."

•SEP environmental call based on given description and same ref. pg. 807

• "...occurs in dolomitized skeletal-moldic crinoidal wackestones to packstones."

Collection methods: Abundances given in Table 50.3. Echinoderms, which dominate the community, come from table 45.25 (Frest et al. 1999, PBDB ref. 4379).

Primary reference: 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]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 24968: authorized by Michael Foote, entered by Michael Foote on 23.08.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
 Monobathrida - Marsupiocrinidae
Marsupiocrinus (Amarsupiocrinus) primaevus
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites cf. ornatus
 Monobathrida - Dolatocrinidae
Allocrinus cf. subglobosus
 Monobathrida - Patelliocrinidae
Macrostylocrinus vermiculatus, Macrostylocrinus compressus
 Diplobathrida - Dimerocrinitidae
Dimerocrinites (Dimerocrinites) sculptus
 Diplobathrida - Lampterocrinidae
Siphonocrinus nobilis
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Caryocrinites "sp. B Witzke 1976"
Gastropoda
 Euomphalina - Platyceratidae
Platyceras sp.
Platyceras sp. Conrad 1840 snail
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
crustose forms
Stenolaemata
 Cryptostomata -
Cryptostomata indet.
Cryptostomata indet. Vine 1884
branching forms
 Cryptostomata - Fenestellidae
Fenestellidae indet.
Rhynchonellata
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929
 Orthida - Platystrophiidae
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820
 Spiriferida - Cyrtiidae
Eospirifer radiatus, "Cyrtia exporrecta" = Cyrtia exporrectus
Eospirifer radiatus Sowerby 1834
"Cyrtia exporrecta" = Cyrtia exporrectus Wahlenberg 1818
 Pentamerida - Camerellidae
Camerella sp.
Camerella sp. Billings 1859
 Atrypida - Atrypidae
Atrypa reticularis
Atrypa reticularis Linnaeus 1758
species name in quotes
 Rhynchonellida - Machaerariidae
Ferganella sp.
Ferganella sp. Nikiforova 1937
Trilobita
 Corynexochida - Illaenidae
Stenopareia sp.
Stenopareia sp. Holm 1886 trilobite
Anthozoa
 Stauriida - Streptelasmatidae
Streptelasmatidae indet.
Streptelasmatidae indet. Nicholson 1889 horn coral
 Cystiphyllida - Tryplasmatidae
Porpites sp.
Porpites sp. Schlotheim 1820 horn coral
 Heliolitida - Heliolitidae
Heliolites sp.
Heliolites sp. Dana 1846 tabulate coral
 Heliolitida - Halysitidae
Halysites sp.
Halysites sp. von Waldheim 1813 tabulate coral