Tabulate Coral-Lamellar Stromatoporoid Comm., Llandovery, E Iowa and NW Illinois (Silurian of the United States)

Where: Iowa (43.0° N, 91.0° W: paleocoordinates 19.4° S, 56.0° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Llandovery (443.4 - 433.4 Ma)

• "Known in Iowa from strata belonging to a range of Llandoverian (Rhuddanian-Telychian) ages."

Environment/lithology: open shallow subtidal; shelly/skeletal wackestone and shelly/skeletal packstone

• degree of skeletal abrasion varies; overturned corals indicate disturbance; intraclasts locally; micritization of skeletal grains (characteristic of photic zone); carbonate mud indicates below effective wave base, but packstones suggest winnowing; position close to wave base preferred BA 2, impinging on BA 3.

•SEP environmental call based on given description and p. 807 in this volume

• "The matrix sediments containing this community are variably characterized by skeletal wackestones and packstones, and some grainstones are present."

Collection methods: Petrographic thin-section point counts given for two localities in table 50.14. I have combined these taxa and others mentioned in text.

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 25041: authorized by Michael Foote, entered by Michael Foote on 26.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda indet. Cuvier 1795 snail
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Bryozoa indet. Ehrenberg 1831
 Strophomenida - Leptellinidae
"Merciella sp." = Leptellina (Merciella)
"Merciella sp." = Leptellina (Merciella) Lamont and Gilbert 1945
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
 Rhynchonellida -
 Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
 Orthida -
Orthida indet. Schuchert and Cooper 1932
 Orthida - Hesperorthidae
Flabellitesia sp. Zhang 1989
 Atrypida - Atrypidae
Atrypa sp. Dalman 1828
 Atrypida -
Protatrypa sp. Boucot et al. 1964
 Athyridida - Meristellidae
"Cryptothyrella sp." = Hindella
"Cryptothyrella sp." = Hindella Davidson 1882
 Phacopida - Encrinuridae
Encrinuridae indet. Angelin 1854 trilobite
 Phacopida - Calymenidae
Calymenidae indet. Milne-Edwards 1840 trilobite
 Corynexochida - Illaenidae
Stenopareia sp. Holm 1886 trilobite
Ostracoda indet. Latreille 1802 ostracod
 Rhombifera -
Crinoidea indet. Miller 1821 Sea lily
Cyclocystoidea indet. Miller and Gurley 1895
 Rugosa -
Rugosa indet. horn coral
two solitary species
 Stauriida - Arachnophyllidae
Arachnophyllum sp. Dana 1846 horn coral
 Heliolitida - Heliolitidae
Heliolites sp. Dana 1846 tabulate coral
 Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813 tabulate coral
 Auloporida - Syringoporidae
Syringopora sp. Goldfuss 1826 tabulate coral
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral
Porifera indet. Grant 1836
 Stromatoporoidea -
Stromatoporoidea indet. stromatoporoid sponge
lamellar forms
 Clathrodictyida - Actinodictyidae
Ecclimadictyon fastigiatum Nicholson 1886 stromatoporoid sponge