Wyoming Quarry. Protomegastrophia-Atrypa Community (Silurian of the United States)

Also known as Protomegastrophia-Atrypa Community, upper Scotch Grove Fm., Jones Co., Iowa

Where: Iowa (42.1° N, 91.0° W: paleocoordinates 23.0° S, 53.5° W)

• coordinate based on political unit

• outcrop-level geographic resolution

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

• "early or mid Wenlockian"

• member-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; shelly/skeletal wackestone and shelly/skeletal carbonate

• 5{
• "occurrence...within crinoidal carbonate mounds...[and] within a mud-rich, skeletal wackestone"

Size class: macrofossils

Collection methods: Includes taxa listed (with abundances) in table 50.10 as well as others mentioned in text. Trilobites not listed here are covered by Mikulik (1979--unpublished PhD diss.), and nautiloids have not yet been studied.

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 25032: authorized by Michael Foote, entered by Michael Foote on 26.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita indet. Walch 1771 trilobite
 Corynexochida - Styginidae
 Phacopida - Cheiruridae
Cheirurus sp. Beyrich 1845 trilobite
 Strophomenida - Sowerbyellidae
Eoplectodonta sp. Kozlowski 1929
 Strophomenida - Leptostrophiidae
 Athyridida - Meristellidae
? Meristina sp. Hall 1867
 Spiriferida - Cyrtiidae
Hedeina sp. Boucot 1957
 Atrypida - Atrypidae
Atrypa reticularis Linnaeus 1758
species name in quotes
 Rhynchonellida -
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp. Hall 1879
 Rhynchonellida - Machaerariidae
Ferganella sp. Nikiforova 1937
 Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
 Orthida - Dalmanellidae
Resserella sp. Bancroft 1928
 Orthida - Platystrophiidae
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
 Euomphalina - Platyceratidae
"Platyostoma sp." = Platyceras (Platyostoma) Conrad 1842 snail
Cyclonema sp. Hall 1852 snail
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
 Fenestrida - Fenestellidae
 Cryptostomata -
Cryptostomata indet. Vine 1884
branching forms
Echinodermata indet. Klein 1754
 Monobathrida -
? Allocrinus sp. Wachsmuth and Springer 1889 Sea lily
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
 Monobathrida -
Calliocrinus sp. Orbigny 1850 Sea lily
 Monobathrida - Patelliocrinidae
 Diplobathrida - Dimerocrinitidae
Dimerocrinites sp. Phillips 1839 Sea lily
 Diplobathrida -
Siphonocrinus sp. Miller 1888 Sea lily
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral
 Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813 tabulate coral
 Rugosa -
Rugosa indet. horn coral