Silica Shale, unit 9 (Devonian of the United States)

Where: Lucas County, Ohio (41.7° N, 83.7° W: paleocoordinates 37.5° S, 30.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Silica Formation, Cazenovia (391.9 - 383.7 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, blue shale

• Shale, bluish-gray with variously shaped concretionary masses of pyrite and many pyritized fossils; strata 2 to 6 inches in thickness. Shale weathers to a clay which becomes sticky when wet. Most of the fossils described from the Silica shale come from this unit.

Size class: macrofossils

Primary reference: G. M. Ehlers, E. C. Stumm, and R. V. Kesling. 1951. Devonian rocks of southeastern Michigan and northwestern Ohio. Stratigraphy field trip, Detroit meeting. Devonian rocks of southeastern Michigan and northwestern Ohio. Stratigraphy field trip, Detroit meeting 1-48 [P. Wagner/P. Wagner/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188934: authorized by Melanie Hopkins, entered by Melanie Hopkins on 21.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Phacopida - Acastidae
Greenops chilmanae
 Proetida - Proetidae
Dechenella (Dechenella) alpenensis, Dechenella (Basidechenella) lucasensis
Rhynchonellata
 Spiriferida - Mucrospiriferidae
Mucrospirifer prolificus
 Spiriferida - Hysterolitidae
Paraspirifer bownockeri