Where: Japan (44.1° N, 141.8° E: paleocoordinates 50.4° N, 132.1° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Upper Haborogawa Formation (Yezo Group), Santonian (86.3 - 83.6 Ma)
• STRATIGRAPHIC RELATIONS: Unit Uf-g, Upper Haborogawa Fm overlying Middle Haborogawa Fm of the Yezo Gp and underyling the Campanian-Maastrichtian Pankezawa Fm. THICKNESS: 800 m. AGE: Santonian, Inoceramus amakusensis zone. STRATIGRAPHIC POSITION: At middle of section, at top of base of 800 m thick Upper Haborogawa Fm. About 120 m above PBDB 62332-34 (DF0065, 67, 69) and 20 m above PBDB 62467 (DF0057).
• group of beds-level stratigraphic resolution
Environment/lithology: offshore; lithified, bioturbated, sandy mudstone
Size class: macrofossils
Collection methods: COLLECTOR: Assumed to be collected by authors (Moriya and Hirano) and supplemented by collections of an earlier author Toshimitsu (see Toshimitsu 1988). REPOSITORY: Unknown repository, posibly Waseda University, Japan.
Primary reference: K. Moriya and H. Hirano. 2001. Cretaceous stratigraphy in the Chikubetsu area, Hokaido. Journal of the Geological Society of Japan 107(3):199-214 [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 62335: authorized by Austin Hendy, entered by Austin Hendy on 18.07.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Acila sp. Adams and Adams 1858 divaricate nutclam | |
Sphenoceramus naumanni Yokoyama 1890 clam | |
Cephalopoda | |
"Naefia matsumotoi" = Longibelus matsumotoi
"Naefia matsumotoi" = Longibelus matsumotoi Hirano 1991 | |
Hyphantoceras orientale ammonite | |
Polyptychoceras (Polyptychoceras) pseudogaultinum Yokoyama 1890 ammonite | |
Tetragonites glabrus, "Gaudryceras denseplicatum" = Gaudryceras (Gaudryceras) denseplicatum
Tetragonites glabrus Jimbo 1910 ammonite
"Gaudryceras denseplicatum" = Gaudryceras (Gaudryceras) denseplicatum Jimbo 1894 ammonite | |
Yokoyamaoceras ishikawai ammonite | |
Damesites sp. Matsumoto 1942 ammonite | |
"Hypophylloceras (Neophylloceras) subramosum" = Neophylloceras, Phyllopachyceras ezoense
"Hypophylloceras (Neophylloceras) subramosum" = Neophylloceras ammonite
Phyllopachyceras ezoense ammonite |