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
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
Conodonta | |
Palmatolepis foliacea conodont | |
Strophomenata | |
Productella rugatula Stainbrook 1945 | |
Floweria prava Hall 1858 | |
"Pseudodouvillina sp." = Sulcatostrophia
"Pseudodouvillina sp." = Sulcatostrophia | |
Nervostrophia extensa Cooper and Dutro 1982 | |
Rhynchonellata | |
"Costatrypa varicostata" = Atryparia (Costatrypa), Spinatrypa trulla, "Pseudatrypa devoniana" = Pseudoatrypa devoniana
"Costatrypa varicostata" = Atryparia (Costatrypa)
"Pseudatrypa devoniana" = Pseudoatrypa devoniana Webster 1921 originally entered as "Pseudoatrypa devoniana"
| |
Calvinaria bransoni Stainbrook 1948 | |
"Schizophoria iowensis" = Schizophoria (Schizophoria) iowensis, Schizophoria amanaensis
"Schizophoria iowensis" = Schizophoria (Schizophoria) iowensis Hall 1858
Schizophoria amanaensis Stainbrook 1945 | |
"Aulacella infera" = Stainbrookia infera
"Aulacella infera" = Stainbrookia infera Calvin 1878 | |
Cephalopoda | |
Manticoceras regulare Fenton and Fenton 1924 ammonite |