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
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 51576: authorized by Austin Hendy, entered by Austin Hendy on 08.06.2005
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Scaphopoda | |
Fissidentalium yokoyamai tusk shell | |
Laevidentalium sp. Cossmann 1888 tusk shell | |
Bivalvia | |
"Bathymalletia inermis" = Malletia
"Bathymalletia inermis" = Malletia clam | |
Nuculana pennula pointed nut clam | |
Yoldia sp. Möller 1842 clam
Yoldia sagittalia Yokoyama 1925 clam | |
Acesta goliath file clam | |
Periploma sp. Schumacher 1816 clam | |
Macoma izurensis tellin clam
Macoma sp. Leach 1819 tellin clam | |
Gastropoda | |
Turritella sp. Lamarck 1799 turret shell | |
Cephalopoda | |
Mizuhobaris izumoensis Yokoyama 1913 octopus |