Amana beds (Devonian of the United States)

Where: Iowa County, Iowa (41.7° N, 92.1° W: paleocoordinates 31.1° S, 37.8° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Amana Beds Formation, Late/Upper Frasnian (379.5 - 376.1 Ma)

• "The Amana Beds were included in the Independence Shale by Stainbrook (1945)...The Amana Beds comprise a 12 metre in-place sequence of dolomitic limestones and calcareous shales...and presumably overlies Cedar Valley Group strata in Iowa County. [shares Palmatolepis foliacae and Manticoceras regulare with Cerro Gordo, and so is correlated with the Elita inconsueta zone]"

• formation-level stratigraphic resolution

Environment/lithology: marine; dolomitic limestone and calcareous shale

• "dolomitic limestones and calcareous shales"

Size class: macrofossils

Primary reference: J. Day. 1988. The brachiopod succession of the Late Givetian-Frasnian of Iowa. In N. J. McMillan, A. F. Embry, and D. J. Glass (eds.), Devonian of the World, Volume III. Canadian Society of Petroleum Geologists. Calgary, Alberta, Canada 303-325 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 35503: authorized by Michael Foote, entered by Michael Foote on 17.12.2003, edited by Alycia Stigall

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Agoniatitida - Gephuroceratidae
Manticoceras regulare Fenton and Fenton 1924 ammonite
Conodonta
 Ozarkodinida - Palmatolepidae
Strophomenata
 Productida - Productellidae
Productella rugatula Stainbrook 1945
 Productida - Monticuliferidae
 Orthotetida - Areostrophiidae
Floweria prava Hall 1858
 Strophomenida - Douvillinidae
 Strophomenida - Leptostrophiidae
Nervostrophia extensa Cooper and Dutro 1982
Rhynchonellata
 Spiriferinida - Cyrtinidae
 Spiriferida - Echinospiriferidae
 Spiriferida - Elythidae
 Atrypida - Atrypidae
Pseudatrypa devoniana
originally entered as "Pseudoatrypa devoniana"
"Costatrypa varicostata" = Atryparia (Costatrypa)
 Rhynchonellida - Leiorhynchidae
Calvinaria bransoni Stainbrook 1948
 Rhynchonellida - Pugnacidae
 Orthida - Schizophoriidae
"Schizophoria iowensis" = Schizophoria (Schizophoria) iowensis Hall 1858
Schizophoria amanaensis Stainbrook 1945
 Orthida - Rhipidomellidae
"Aulacella infera" = Stainbrookia infera
"Aulacella infera" = Stainbrookia infera Calvin 1878