Where: Howard County, Arkansas (33.8° N, 93.9° W: paleocoordinates 37.9° N, 65.7° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Annona Formation (Taylor Group), Late/Upper Campanian (83.5 - 70.6 Ma)
• STRATIGRAPHIC RELATIONS: From the Annona Fm, which regionally overlies the Ozan Fm, and is overlain by the Marlbrook Fm, all of the Taylor Gp. AGE: Late Campanian on the basis of ammonite biostratigraphy; Baculites gregoryensis/B. reduncus zone. STRATIGRAPHIC POSITION: From phosphate bed at very base of Annona Fm.
• bed-level stratigraphic resolution
Environment/lithology: lithified, concretionary, phosphatic, black, brown, yellow, conglomeratic lime mudstone
Size class: macrofossils
Preservation: cast, mold/impression, original calcite
Collected by Kennedy et al. in 1973-1974; reposited in the USNM
Collection methods: surface (in situ),
• COLLECTOR: W.J. Kennedy, W.A. Cobban, R.E. Burkholder, and B.F. Clardy, 1974-1974. REPOSITORY: USNM, Washington DC.
Primary reference: W. J. Kennedy and W. A. Cobban. 1993. Upper Campanian ammonites from the Ozan-Annona Formation boundary in Southwestern Arkansas. Bulletin of the Geological Society of Denmark 40:115-148 [A. Hendy/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 83054: authorized by Austin Hendy, entered by Austin Hendy on 06.08.2008
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
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Bivalvia | |
Atreta sp. Etallon 1862 scallop | |
Spondylus sp. Linnaeus 1758 scallop | |
Pycnodonte sp. Fischer von Waldheim 1835 oyster | |
Inoceramus sp. Sowerby 1814 clam | |
Cephalopoda | |
Eutrephoceras sp. Hyatt 1894 nautiloid | |
Trachyscaphites redbirdensis ammonite | |
Oxybeloceras crassum Whitfield 1877 ammonite | |
Baculites sp. Lamarck 1799 ammonite
Baculites reduncus ammonite
Baculites taylorensis Adkins 1929 ammonite | |
Didymoceras sp., Didymoceras mortoni, Didymoceras cochleatum, Didymoceras tortum, "Nostoceras (Nostoceras) platycostatum" = Didymoceras platycostatum, Nostoceras (Nostoceras) arkansanum
Didymoceras sp. Hyatt 1900 ammonite
Didymoceras mortoni ammonite
Didymoceras cochleatum ammonite
Didymoceras tortum ammonite
"Nostoceras (Nostoceras) platycostatum" = Didymoceras platycostatum Kennedy and Cobban 1993 ammonite
Nostoceras (Nostoceras) arkansanum ammonite | |
Pseudophyllites sp. Kossmat 1895 ammonite | |
Pachydiscus (Pachydiscus) sp. Zittel 1884 ammonite
Menuites cf. portlocki Sharp 1855 ammonite | |
Desmophyllites diphylloides Forbes 1846 ammonite | |
Placenticeras sp. Meek 1876 ammonite | |
Gastropoda | |
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