Beds 11-16, Graf Section (Ordovician of the United States)

Where: Dubuque County, Iowa (42.5° N, 90.9° W: paleocoordinates 20.1° S, 59.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Amplexograptus manitoulinensis graptolite zone, Elgin Member (Scales Shale Formation), Richmondian (449.6 - 445.5 Ma)

• "Elgin Shaly Limestone Member"

• group of beds-level stratigraphic resolution

Environment/lithology: limestone

• Environmental call by T. Hanson.
• Limestone, occasional shale partings. Lithology from C. O. Leverson, A. J. Gerk, R. E. Sloan, & L. A. Bisagno. General section of the Middle and Late Ordovician strata of Northeastern Iowa, Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p.25-39. Edited by R. E. Sloan.

Size class: macrofossils

Primary reference: H. B. Whittington. 1971. A New Calymenid Trilobite from the Maquoketa Shale, Iowa. Smithsonian Contributions to Paleobiology 3:129-136 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 192902: authorized by Pete Wagner, entered by Pete Wagner on 24.04.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

• Faunal list compiled from: 1. Whitfield's (1882) report in volume 4 of Chamberlin's Geology of Wisconsin 2. Clarke's (1897) report in volume III part 2 of Winchell's Final Reports of the Minnesota Geological and Natural History Survey 3. Bassler's Index 4. Individual articles (Foerste, Flower, etc.) 5. Treatise, Part K 6. Author's personal field data.
Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Diplograptidae
"Orthograptus abbreviatus" = Rectograptus abbreviatus
"Orthograptus abbreviatus" = Rectograptus abbreviatus Elles and Wood 1907 graptolite
Orthograptus truncatus abbreviatus
Trilobita
 Phacopida - Calymenidae
Thelecalymene mammillata
Thelecalymene mammillata Hall 1861 trilobite