Silica Formation Unit 17 (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: "limestone, massive and argillaceous at base, becomign very argillaceous at top, dark-gray"

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 38468: authorized by Michael Foote, entered by Michael Foote on 21.04.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

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Strophomenata
 Strophomenida - Strophodontidae
Pholidostrophia nacrea
Rhynchonellata
 Spiriferida - Mucrospiriferidae
Mucrospirifer mucronatus
 Spiriferida - Ambocoeliidae
"Ambocoelia" "umbonata"
 Rhynchonellida - Leiorhynchidae
Leiorhynchus kelloggi, Leiorhynchus "sp. A"
 Rhynchonellida - Trigonirhynchiidae
Cupularostrum prolificum
 Orthida - Draboviidae
Sphenophragmus cf. nanus
Stenolaemata
 Cystoporida - Sulcoreteporidae
Sulcoretepora "sp. A"
 Cyclostomata - Hederellidae
Hederella alpenensis
 Cryptostomata - Hyphasmoporidae
Streblotrypa sp.