Ferganella Community, Behr Quarry, Welton, Iowa. (Silurian of the United States)

Where: Iowa (41.9° N, 90.6° W: paleocoordinates 21.3° S, 55.8° W)

• coordinate based on political unit

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

Collection methods: Abundances given in Table 50.3. Echinoderms, which dominate the community, are not listed (see 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 24969: authorized by Michael Foote, entered by Michael Foote on 23.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Cephalopoda
 Orthocerida - Kionoceratidae
Kionoceras sp. Hyatt 1884
 Orthocerida - Dawsonoceratidae
Dawsonoceras sp. Hyatt 1884
 Orthocerida - Orthoceratidae
Michelinoceras sp. Foerste 1932
 Oncocerida - Acleistoceratidae
Amphicyrtoceras sp. Foerste 1924
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail
 Euomphalina - Platyceratidae
Platyceras sp. Conrad 1840 snail
Rhynchonellata
 Pentamerida - Camerellidae
Camerella sp. Billings 1859
 Pentamerida - Gypidulidae
Gypidulidae indet. Schuchert and Le Vene 1929
sp. 1 and 2
 Rhynchonellida -
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp. Hall 1879
 Rhynchonellida - Machaerariidae
Ferganella sp. Nikiforova 1937
 Spiriferida - Cyrtiidae
Hedeina sp. Boucot 1957
Eospirifer radiatus Sowerby 1834
"Cyrtia exporrecta" = Cyrtia exporrectus Wahlenberg 1818
 Atrypida - Atrypidae
Atrypa reticularis Linnaeus 1758
species name in quotes
Plectatrypa sp. Schuchert and Cooper 1930
 Athyridida - Meristellidae
Meristina sp. Hall 1867
Whitfieldella sp. Hall and Clarke 1893
 Orthida - Platystrophiidae
 Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Resserella sp. Bancroft 1928
 Protorthida - Skenidiidae
? Skenidioides sp. Schuchert and Cooper 1931
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
 Strophomenida - Strophodontidae
"Protomegastrophia profunda" = Brachyprion (Protomegastrophia) profunda
"Protomegastrophia profunda" = Brachyprion (Protomegastrophia) profunda Hall 1852
 Strophomenida - Sowerbyellidae
Eoplectodonta sp. Kozlowski 1929
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
name corrected from "Coolina"
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
crustose forms
Stenolaemata
 Cryptostomata -
Cryptostomata indet. Vine 1884
branching forms
 Cryptostomata - Fenestellidae
 Cryptostomata - Rhinoporidae
Lichenalia sp. Hall 1851
Trilobita
 Corynexochida - Illaenidae
Bumastus sp. Murchison 1839 trilobite
Stenopareia sp. Holm 1886 trilobite
 Phacopida - Calymenidae
Calymenidae indet. Milne-Edwards 1840 trilobite
Anthozoa
 Cystiphyllida - Tryplasmatidae
Porpites sp. Schlotheim 1820 horn coral
 Stauriida - Streptelasmatidae
Streptelasmatidae indet. Nicholson 1889 horn coral
 Heliolitida - Heliolitidae
Heliolites sp. Dana 1846 tabulate coral
 Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813 tabulate coral