Hikagenosawa Fm. of Southern Oyubari (Y070129) (Cretaceous of Japan)

Where: Hokkaido, Japan (44.0° N, 143.0° E: paleocoordinates 53.5° N, 137.0° E)

• coordinate based on political unit

• basin-level geographic resolution

When: M7 Member (Hikagenosawa Formation), Early/Lower Cenomanian (99.6 - 93.5 Ma)

• syn: Hikagenosawa shale

• member-level stratigraphic resolution

Environment/lithology: offshore; lithified mudstone and tuff

• Appears to be a deep water facies, but near enough to shore to have tuffs. Collection consist of inoceramids and ammonites, regarded as deep-water faunas.
• M7: laminated mudstone with acidic tuff intercalations

Primary reference: F. Kawabe. 2000. Cretaceous Stratigraphy in the Oyubari Area, Central Hokkaido, Japan. Bulletin of the National Science Museum. Series C: Geology and Paleontology 26(1-2):9-56 [A. Miller/C. Ferguson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 62181: authorized by Arnold Miller, entered by Chad Ferguson on 13.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Biostratigraphic topic of the paper might preclude mention of taxa other than inoceramids and ammonites
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Tetragonitidae
Zelandites inflatus
Zelandites inflatus Matsumoto 1959 ammonite
1-2 specimens
 Ammonitida - Turrilitidae
Mariella dorsetensis
Mariella dorsetensis Spath 1926 ammonite
1-2 specimens