Hedeina-Gypidulid Community, upper Scotch Grove Fm., eastern Iowa (Silurian of the United States)

Where: Iowa (42.0° N, 91.0° W: paleocoordinates 23.1° S, 53.5° W)

• coordinate based on political unit

• basin-level geographic resolution

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

• Apparently restricted in Iowa to units of mid-Wenlockian age. Waubeek and upper Buck Creek Quarry Members of the upper Scotch Grove Formation.

• formation-level stratigraphic resolution

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

• "...intermound facies..deeper than coeval mounds which are BA 3...[fauna and relations with adjacent communities suggest BA3 or transitional BA3-4]...skeletal grains unabraded, evidence for winnowing of mud absent, brachiopod valves commonly articulated...articulated crinoid cups...quiet environments generally below normal wave base; evidence for storm currents not found, suggesting deeper (or quieter) conditions than most Iowa BA 3 communities...tentatively assigned outer BA 3 to inner BA 4."

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

• "..dolomitized skeletal wackestones and mudstones"

Collection methods: See Frest et al. (1999--PBDB ref. 4379) for echinoderms of Dimerocrinites-Hedeina Community. I have combined two lists with abundances in table 50.6, as well as additional taxa 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 25019: authorized by Michael Foote, entered by Michael Foote on 26.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Cyathocrintes cf. striatissimus
"Cyathocrinites (R.) striatissimus"
Trilobita indet. Walch 1771 trilobite
 Corynexochida - Illaenidae
Illaenidae indet. Hawle and Corda 1847 trilobite
Bumastus sp. Murchison 1839 trilobite
 Phacopida - Dalmanitidae
Dalmanites sp. Barrande 1852 trilobite
 Phacopida - Encrinuridae
Encrinuridae indet. Angelin 1854 trilobite
Encrinurus sp. Emmrich 1844 trilobite
 Phacopida - Cheiruridae
Cheiruridae indet. Hawle and Corda 1847 trilobite
Cheirurus sp. Beyrich 1845 trilobite
 Phacopida - Calymenidae
Calymene sp. Brongniart 1822 trilobite
 Proetida - Proetidae
Proetus sp. Steininger 1831 trilobite
Brachiopoda indet. Cuvier 1805
 Orthotetida - Triplesiidae
Streptis sp. Davidson 1881
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
name corrected from "Coolina"
 Strophomenida - Sowerbyellidae
Eoplectodonta sp. Kozlowski 1929
 Strophomenida - Stropheodontidae
 Strophomenida - Leptostrophiidae
? Leptostrophia sp. Hall and Clarke 1892
genus name in quotes
 Strophomenida - Rafinesquinidae
aff. Lepidoleptaena sp. Havlicek 1963
leptaenid aff. Lepidoleptaena
"Leptaenidae indet." = Leptaeninae Hall and Clarke 1894
Leptaena sp. Dalman 1828
 Strophomenida - Strophomenidae
Pentlandina sp. Bancroft 1949
 Dictyonellida - Eichwaldiidae
"Dictyonella sp." = Eodictyonella
"Dictyonella sp." = Eodictyonella Wright 1994
 Athyridida - Meristellidae
Whitfieldella sp. Hall and Clarke 1893
Meristina sp. Hall 1867
 Athyridida - Anoplothecidae
? Coelospira sp. Hall 1863
 Spiriferida -
Spiriferida indet. Waagen 1883
 Spiriferida - Cyrtiidae
Cyrtia sp. Dalman 1828
Hedeina sp. Boucot 1957
 Spiriferida -
"Cyrtiacea indet." = Cyrtioidea
"Cyrtiacea indet." = Cyrtioidea Frederiks 1924
 Spiriferida - Delthyrididae
? Delthyris sp. Dalman 1828
 Pentamerida - Camerellidae
Camerella sp. Billings 1859
 Pentamerida - Gypidulidae
Gypidulidae indet. Schuchert and Le Vene 1929
Gypidula sp. Hall 1867
 Atrypida - Atrypidae
Plectatrypa sp. Schuchert and Cooper 1930
Atrypa sp. Dalman 1828
 Rhynchonellida -
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp. Hall 1879
 Rhynchonellida - Machaerariidae
Ferganella sp. Nikiforova 1937
 Orthida -
Orthida indet. Schuchert and Cooper 1932
indet. orthid A
 Orthida - Rhipidomellidae
Dalejina spp. Havlicek 1953
 Orthida - Dalmanellidae
Dalmanellidae indet. Schuchert 1913
Isorthis sp. Kozlowski 1929
Resserella sp. Bancroft 1928
 Craniida - Craniidae
Craniidae indet. Menke 1828
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
 Ostreida - Pterineidae
? Actinopteria sp. Hall 1884 oyster
Gastropoda indet. Cuvier 1797 snail
 Euomphalina - Euomphalidae
? Poleumita sp. Clarke and Ruedemann 1903 snail
 Euomphalina - Holopeidae
Raphistomina sp. Ulrich and Scofield 1897 snail
 Euomphalina - Platyceratidae
Platyceras sp. Conrad 1840 snail
"Platyostoma sp." = Platyceras (Platyostoma) Conrad 1842 snail
 Euomphalina - Oriostomatidae
Oriostoma sp. Munier-Chalmas 1876 snail
 Murchisoniina - Phanerotrematidae
? Phanerotrema sp. Fischer 1885 snail
 Orthocerida - Dawsonoceratidae
Dawsonoceras sp. Hyatt 1884
 Fenestrida - Fenestellidae
 Cryptostomata -
Cryptostomata indet. Vine 1884
branching forms
 Trepostomata -
Trepostomata indet. Ulrich 1882
crustose forms
 Glyptocystitoida - Callocystitidae
Hallicystis sp. Jaekel 1899
Crinoidea indet. Miller 1821 Sea lily
 Disparida -
Myelodactylus sp. Hall 1852 Sea lily
 Pisocrinida - Pisocrinidae
Pisocrinus sp. de Koninck 1858 Sea lily
 Monobathrida - Carpocrinidae
? Carpocrinus sp. Muller 1840 Sea lily
 Monobathrida -
? Lyonicrinus sp. Springer 1926 Sea lily
 Monobathrida - Marsupiocrinidae
Marsupiocrinidae indet. Bronn 1855 Sea lily
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
 Monobathrida -
Platycrinitacea indet. Austin and Austin 1843 Sea lily
Manticrinus sp. Ausich 1986 Sea lily
 Diplobathrida - Dimerocrinitidae
 Tabulata -
Tabulata indet. tabulate coral
 Auloporida - Syringoporidae
Syringopora sp. Goldfuss 1826 tabulate coral
 Favositida - Favositidae
Favositidae indet. Dana 1846 tabulate coral
 Favositida - Alveolitidae
Alveolitidae indet. Duncan 1872 tabulate coral
 Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813 tabulate coral
 Heliolitida - Heliolitidae
Heliolites sp. Dana 1846 tabulate coral
 Rugosa -
Rugosa indet. horn coral
small cylindrical solitary rugosan
 Cystiphyllida - Tryplasmatidae
Porpites sp. Schlotheim 1820 horn coral
 Cystiphyllida - Cystiphyllidae
Cystiphyllidae indet. Milne-Edwards and Haime 1850 horn coral
 Stauriida - Streptelasmatidae
Streptelasmatidae indet. Nicholson 1889 horn coral
 Stauriida - Arachnophyllidae
Arachnophyllum sp. Dana 1846 horn coral