Silica Formation Units 20-23 (Devonian of the United States)
Where: Ohio (41.7° N, 83.7° W: paleocoordinates 36.4° S, 31.0° W)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Silica Formation, Givetian (387.7 - 382.7 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: marine; gray, argillaceous limestone
• Overall sequence: Bioclastic limestone; argillaceous limestone; shale. This unit: 20: "limestone, argillaceous, dark-gray"; 21: "limestone, massive, slightly argillaceous, dark-gray, many marcasite concretions, harder than units below and above"; 22: limestone, massive, argillaceous, dark-gray, some marcasite concretions"; 23: "limestone, massive, argillaceous, dark-gray...many marcasite concretions, grading into units below and above but harder than either"
Primary reference: R. V. Kesling and R. B. Chilman. 1975. Strata and megafossils of the Middle Devonian Silica Formation. University of Michigan Papers on Paleontology 8:1-408 [M. Foote/M. Foote/M. Foote]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 38471: authorized by Michael Foote, entered by Michael Foote on 21.04.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
| Anthozoa | |
|
Anthozoa indet. Ehrenberg 1834 | |
| Strophomenata | |
"Strophodonta spp." = Strophomena (Strophodonta)
"Strophodonta spp." = Strophomena (Strophodonta) Hall 1852 | |
| Rhynchonellata | |
| Stenolaemata | |
|
Fenestrellina spp. d'Orbigny 1849 | |