Locality 2 (Arakida Formation) (Miocene of Japan)

Where: Nagano, Japan (35.8° N, 137.9° E: paleocoordinates 39.9° N, 135.3° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Arakida Formation (Tomikusa Group), Early/Lower Miocene (23.0 - 16.0 Ma)

• From mudstone, overlaying thick alternating beds of sandstone and mudstone in the middle part of the Arakida Formation, Tomikusa Group. Early Miocene

• bed-level stratigraphic resolution

Environment/lithology: deep-water; lithified mudstone

• From faunal composition this looks like an offshore-deep-water environment (100-250 m).
• Mudstone

Size class: macrofossils

Preservation: mold/impression

Collection methods: quarrying,

• Repository of material is not known.

Primary reference: A. Suzuki. 1995. Cephalopod fossil from the miocene Tomikusa Group in the southern part of Nagano Prefecture, central Japan. Bulletin of the Mizunami Fossil Museum 22:115-120 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51577: authorized by Austin Hendy, entered by Austin Hendy on 08.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for a depauperate fauna. Nomenclature appears to be of good quality.
Show authors, comments, and common names
unclassified
  -
Delecopecten peckhami
Bivalvia
 Nuculanida - Yoldiidae
Yoldia sagittalia
Yoldia sagittalia Yokoyama 1925 clam
 Nuculanida - Malletiidae
"Bathymalletia inermis" = Malletia, "Bathymalletia sp." = Malletia
"Bathymalletia inermis" = Malletia clam
"Bathymalletia sp." = Malletia des Moulins 1832 clam
 Nuculanida - Nuculanidae
Nuculana pennula
Nuculana pennula pointed nut clam
 Thraciida - Periplomatidae
Periploma sp.
Periploma sp. Schumacher 1816 clam
Scaphopoda
 Dentaliida - Laevidentaliidae
Laevidentalium sp.
Laevidentalium sp. Cossmann 1888 tusk shell