cephalopods unit, Gomi Quarry (Silurian of Japan)

Where: Skikoku, Japan (33.5° N, 133.2° E: paleocoordinates 33.5° N, 133.2° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ludlow (427.4 - 423.0 Ma)

• Cerauroides orientalis horizon, in stage G3 (Early Ludlovian)

Environment/lithology: reef, buildup or bioherm; lithified reef rocks and lithified, red shale

• submarine talus deposits along the outer slope of the wave resistant reef front [redeposited]
• limestone breccia with red shale

Size class: macrofossils

Collected by Y. Sako, T. Mizobuchi

Primary reference: T. Kobayashi, J. Katto, and T. Hamada. 1984. New observations of Shiroishi-ohsawa, Mt. Yokokura, Kochi Prefecture with palaeontological studies on the cephalopods and trilobites from the locality. Research Report of the Kochi University 32:235-258 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188691: authorized by Melanie Hopkins, entered by Melanie Hopkins on 13.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Dissidocerida - Geisonoceratidae
? Protokionoceras fessicancellatum n. sp.
? Protokionoceras fessicancellatum n. sp. Kobayashi et al. 1984
 Orthocerida - Arionoceratidae
Arionoceras densiseptum n. sp., ? Arionoceras densiseptum
Arionoceras densiseptum n. sp. Kobayashi et al. 1984
? Arionoceras densiseptum Kobayashi et al. 1984
 Orthocerida - Orthoceratidae
? Michelinoceras sp., Michelinoceras mizobuchii n. sp., Michelinoceras alticameratum n. sp., Orthocycloceras gomiense n. sp., Orthocycloceras aff. gomiense, Leurocycloceras sp.
? Michelinoceras sp. Foerste 1932
Michelinoceras mizobuchii n. sp. Kobayashi et al. 1984
Michelinoceras alticameratum n. sp. Kobayashi et al. 1984
Orthocycloceras gomiense n. sp. Kobayashi et al. 1984
Orthocycloceras aff. gomiense Kobayashi et al. 1984
Leurocycloceras sp. Foerste 1928