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

unclassified
  -
Trilobita
 Phacopida - Phacopidae
"Phacops rana" = Eldredgeops rana
"Phacops rana" = Eldredgeops rana Green 1832 trilobite
Bivalvia
 Ostreida - Pterineidae
Tentaculita
 Styliolinida - Styliolinidae
Stenolaemata
 Fenestrata -
 Cyclostomata - Hederellidae
 Cystoporida - Sulcoreteporidae
 Cystoporida - Fistuliporidae
 Cryptostomata -
 Cryptostomata - Arthrostylidae
 Cryptostomata - Hyphasmoporidae
 Rhabdomesida - Nikiforovellidae
Blastoidea
 Spiraculata -
 Fissiculata - Phaenoschismatidae
Crinoidea
 Calceocrinida - Calceocrinidae
Cunctocrinus fortunatus Kesling and Sigler 1969 Sea lily
 Sagenocrinida -
 Cladida -
 Inadunata - Poteriocrinidae
 Camerata - Rhodocrinidae
 Monobathrida -
 Diplobathrida -
Lophophorata
 Tentaculitida - Tentaculitidae
Strophomenata
 Productida - Productellidae
 Productida - Chonetidae
 Strophomenida - Leptostrophiidae
 Strophomenida - Strophodontidae
Rhynchonellata
 Athyridida - Athyrididae
 Spiriferinida - Cyrtinidae
 Spiriferida - Mucrospiriferidae
 Atrypida - Atrypidae
Atrypa "reticularis" Linnaeus 1758
 Orthida - Rhipidomellidae
Anthozoa
 Auloporida - Aulocystidae
Aulocystis flabellata tabulate coral
 Auloporida - Auloporidae