Atrypa 'reticularis'-Dimerocrinites (Eudimerocrinites) sp. Assoc., Krapfl Quarry (Silurian of the United States)

Where: Iowa (42.5° N, 91.5° W)

• Paleocoordinates: 26.1° S, 106.3° W (Wright 2013)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Farmers Creek Member (Hopkinton Formation), Llandovery (443.4 - 433.4 Ma)

• Middle part of F.C. Member. "Late Llandovery (probably C4)"

• bed-level stratigraphic resolution

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

• "Brachiopods and other fossils mostly whole...whole echinoderms very rare...mostly as scattered large debris..some indication of localized winnowing, but otherwise few signs of wave or curren disturbance...association underlies Cyclocrinites-Dimerocrinites (E.) Assoc. and interfingers laterally with a Bolicrinus-Theleproktocrinus Assoc. at type locality. A position somewhere on outer BA 3 to shallow BA 4 is likely"

•

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

• "Abundantly fossiliferous, a porous, noncherty, skeletal-moldic, finely crystalline dolopackstone that is almost a grainstone."

Collection methods: Brachiopod, echinoderm, and gastropod abundances given in table 45.21.

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26711: authorized by Michael Foote, entered by Michael Foote on 25.10.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Crinoidea
 Monobathrida - Patelliocrinidae
Macrostylocrinus "sp. D Witzke and Strimple"
 Diplobathrida - Dimerocrinitidae
Dimerocrinites (Eudimerocrinites) sp.
 Glyptosphaeritida - Gomphocystitidae
Gomphocystites sp.
Brachiopoda
  -
Brachiopoda indet.
Brachiopoda indet. Cuvier 1805
Rhynchonellata
 Atrypida - Atrypidae
Atrypa "reticularis"
Atrypa "reticularis" Linnaeus 1758
 Athyridida - Meristellidae
Meristina sp.
Meristina sp. Hall 1867
 Pentamerida - Pentameridae
Harpidium (Isovella) maquoketa
 Orthida -
Orthida indet.
Orthida indet. Schuchert and Cooper 1932
 Orthida - Platystrophiidae
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820
Strophomenata
 Strophomenida - Leptostrophiidae
Protomegastrophia sp.
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail