Loc. 6098a (cycle W-10) - Waita Formation (Oligocene of Japan)

Where: Japan (33.8° N, 130.5° E: paleocoordinates 40.3° N, 126.4° E)

• small collection-level geographic resolution

When: Waita Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• STRATIGRAPHIC RELATIONS: From Waita Fm, which overlies the Honjo Fm of the Ashiya Gp. THICKNESS: From individual bed within formation that reaches 450 m in thickness. AGE: latest Early Oligocene according to Sakakura (2002) on the basis of calcareous nannoplankton and foraminifera (see Saito and Okada, 1984; Tsuchi et al., 1987). STRATIGRAPHIC POSITION: From cycle W-10, near top of formation.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; poorly lithified, bioturbated sandstone

• ENVIRONMENT: Shallow shelf to offshore siliciclastic environment. From transgressive phase of relative sea-level fluctuation.
• SPECIFIC LITHOLOGY: Bioturbated sandstone. LITHIFICATION: Poorly lithified on the basis of figured specimens and age.

Size class: macrofossils

Collection methods: COLLECTOR: Presumably Sakakura (c. 2002). REPOSITORY: Possibly Kyoto University, Kyoto, Japan.

Primary reference: N. Sakakura. 2002. Taphonomy of bivalve assemblages in the upper part of the Paleogene Ashiya Group, southwestern Japan. Paleontological Research 6(1):101-120 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 70765: authorized by Austin Hendy, entered by Austin Hendy on 04.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia, gastropoda, and inclusive of scaphopods, cirripeds, and echinoids. NOMENCLATURE: Not an authoritative publication, but utilizing relatively modern nomenclature, though not assigned subgenus-level identifications and many occurrences lacking species names.
 Arcida - Arcidae
"Arca sakamizuensis" = Arca (Arca) sakamizuensis
"Arca sakamizuensis" = Arca (Arca) sakamizuensis Hatai and Nisiyama 1952 ark
 Pectinida - Pectinoidae
Chlamys sp. Röding 1798 scallop
 Pectinida - Anomiidae
"Monia sp." = Pododesmus (Monia)
"Monia sp." = Pododesmus (Monia) Gray 1850 scallop
 Carditida - Crassatellidae
 Carditida - Carditidae
"Venericardia subnipponica" = Venericardia (Venericor) subnipponica
"Venericardia subnipponica" = Venericardia (Venericor) subnipponica Nagao 1928 clam
 Cardiida - Veneridae
"Phacosoma chikuzenensis" = Dosinia (Phacosoma)
"Phacosoma chikuzenensis" = Dosinia (Phacosoma) venus clam
 Neogastropoda - Volutidae
Fulgoraria sp. Schumacher 1817 volute
 Neogastropoda - Muricidae
 Naticoidea - Naticidae
"Euspira ashiyaensis" = Euspira meisensis
"Euspira ashiyaensis" = Euspira meisensis Makiyama 1926 moon snail
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell