Where: Japan (44.1° N, 141.8° E: paleocoordinates 50.4° N, 132.1° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Middle Haborogawa Formation (Yezo Group), Santonian (86.3 - 83.6 Ma)
• STRATIGRAPHIC RELATIONS: Unit Uf-g, Middle Haborogawa Fm overlain by Upper Haborogawa Fm of the Yezo Gp and the Campanian-Maastrichtian Pankezawa Fm. THICKNESS: 450 m. AGE: Santonian, Inoceramus amakusensis zone. STRATIGRAPHIC POSITION: Near base of section, near middle of 450 m thick Middle Haborogawa Fm. Slighty higher (~100 m) in section than PBDB# 62209.
• bed-level stratigraphic resolution
Environment/lithology: offshore; lithified, bioturbated, silty sandstone
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 62210: authorized by Austin Hendy, entered by Austin Hendy on 14.07.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Anthozoa | |
Anthozoa indet. Ehrenberg 1834 | |
Bivalvia | |
Inoceramus (Inoceramus) cf. amakusensis Nagao and Matsumoto 1940 clam
Sphenoceramus naumanni Yokoyama 1890 clam | |
Parvamussium sp. Sacco 1897 mud scallop | |
Acila sp. Adams and Adams 1858 divaricate nutclam | |
Cephalopoda | |
| |
Phyllopachyceras ezoense, Phyllopachyceras sp., "Hypophylloceras (Neophylloceras) subramosum" = Neophylloceras, "Hypophylloceras (Neophylloceras) sp." = Neophylloceras
Phyllopachyceras ezoense ammonite
Phyllopachyceras sp. Spath 1925 ammonite
"Hypophylloceras (Neophylloceras) subramosum" = Neophylloceras ammonite
"Hypophylloceras (Neophylloceras) sp." = Neophylloceras Shimizu 1934 ammonite | |
Polyptychoceras (Subptychoceras) sp. Shimizu 1935 ammonite
Polyptychoceras (Polyptychoceras) cf. pseudogaultinum Yokoyama 1890 ammonite | |
"Gaudryceras cf. denseplicatum" = Gaudryceras (Gaudryceras) denseplicatum, Tetragonites sp., Tetragonites glabrus
"Gaudryceras cf. denseplicatum" = Gaudryceras (Gaudryceras) denseplicatum Jimbo 1894 ammonite
Tetragonites sp. Kossmat 1895 ammonite
Tetragonites glabrus Jimbo 1910 ammonite | |
Pachydiscidae indet. Spath 1922 ammonite | |
Yokoyamaoceras ishikawai ammonite
Yokoyamaoceras sp. Wright and Matsumoto 1954 ammonite | |
Damesites sp. Matsumoto 1942 ammonite | |
Collignoniceratidae indet. Wright and Wright 1951 ammonite | |
Gastropoda | |
Gastropoda indet. Cuvier 1795 snail |