Silica Formation Unit 13 (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, calcareous shale
• Overall sequence: Bioclastic limestone; argillaceous limestone; shale. This unit: "shale, calcareous, dark-gray. where unit 12 is developed as a limestone lens...shale contains many crinoids and blastoids [and bryozoans]...At other places, where unit 12 is represented by shale, top of unit contains comminuted echinoderm columnals and concentrations of bryozoa"
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 38464: 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
unclassified | |
Anthozoa | |
Planalveolitella parasitica tabulate coral | |
Aulocystis flabellata tabulate coral | |
Bivalvia | |
Cornellites flabellum oyster | |
Lophophorata | |
Tentaculites bellulus Hall 1876 | |
Strophomenata | |
Devonochonetes coronatus Hall 1857 | |
Protoleptostrophia perplana Conrad 1839 | |
Spinulicosta spinulicosta Hall 1857 | |
Rhynchonellata | |
Rhipidomella vanuxemi Hall 1857 | |
Atrypa "reticularis" Linnaeus 1758 | |
Cyrtina hamiltonensis Hall 1857 | |
Stenolaemata | |
Tentaculita | |
Styliolina fissurella Hall 1879 | |
Trilobita | |
"Phacops rana" = Eldredgeops rana
"Phacops rana" = Eldredgeops rana Green 1832 trilobite | |
Crinoidea | |
Arthroacantha carpenteri Sea lily | |
Corocrinus noduosus Sea lily | |
Opsiocrinus mariae Sea lily | |
Gilbertsocrinus ohioensis Sea lily | |
? Euryocrinus laddii Sea lily | |
Decadocrinus stewartae Sea lily | |
Proctothylacocrinus longus Sea lily | |
Cunctocrinus fortunatus Kesling and Sigler 1969 Sea lily | |
Blastoidea | |
Nucleocrinus cf. elegans Conrad 1842 blastoid | |
Hyperoblastus reimanni blastoid |