Yumoto [Asagai Fm] (Oligocene of Japan)

Where: Japan (37.0° N, 140.9° E: paleocoordinates 43.0° N, 137.7° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Asagai Formation (Shirimazu Group), Late/Upper Oligocene (28.4 - 23.0 Ma)

• LITHOSTRATIGRAPHY: From the Asagai Fm of the Shirimazu Gp.. AGE: Late Oligocene. STRATIGRAPHIC POSITION: From unknown position within formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; fine-grained sandstone

• ENVIRONMENT: Not stated, but apparently shallow marine siliciclastic.
• SPECIFIC LITHOLOGY: Fine-grained sandstone. LITHIFICATION: Unknown.

Size class: microfossils

Collected by Asano

Collection methods: sieve,

• COLLECTOR: K. Asano. REPOSITORY Institute of Geology and Paleon- tology, Tohoku University, Sendai..

Primary reference: K. Asano. 1949. Foraminifera from the Asagai Formation (Tertiary) of Fukushima Prefecture, Japan. Journal of Paleontology 23(5):473-478 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 91371: authorized by Austin Hendy, entered by Austin Hendy on 16.09.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for foraminifera. NOMENCLATURE: Authoritative publication, with somewhat modern nomenclature, and species resolution identifications.
Nodosariata
 Vaginulinida - Vaginulinidae
? Saracenaria sp. Defrance 1824
Lenticulina fukushimaensis n. sp. Asano 1949
Globothalamea
 Rotaliida - Cibicididae
 Rotaliida - Nonionidae
Foraminifera
 Rotalioidea - Elphidiidae
Elphidium asagaiense n. sp. Asano 1949
Elphidium yumotoense n. sp. Asano 1949
 Lituolida - Lituolidae
Ammobaculites yumotoensis n. sp. Asano 1949
Cyclammina cf. incisa Stache 1864
 Trochamminacea - Trochamminidae