Utoö Mine, north slope of Mt. Buko (Triassic to of Japan)

Also known as Chichibu Cement Co. Mine

Where: Saitama, Japan (36.0° N, 139.1° E: paleocoordinates 43.7° N, 122.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Buko Limestone Formation, Ladinian to Ladinian (242.0 - 228.0 Ma)

• "basal part" of the formation (Tamura et al. 1978)

• formation-level stratigraphic resolution

Environment/lithology: limestone

Size class: macrofossils

Primary reference: M. Tamura, S. Kawada, A. Takeda, H. Oguri, T. Saito, K. Tsuchida, and M. Inoue. 1978. A Find of Triassic Molluscs from the Buko Limestone Formation, Chichibu, Saitama Prefecture . Proceedings of the Japan Academy (Series B: Physical and Biological Sciences) 54(2):41-44 [A. Dunhill/B. Allen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 201826: authorized by Alex Dunhill, entered by Bethany Allen on 31.05.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Anomiidae
"Plicatula (Pseudoplacunopsis) fissistriata" = Placunopsis fissistriata
"Plicatula (Pseudoplacunopsis) fissistriata" = Placunopsis fissistriata Winckler 1861 scallop
 Pectinida - Entoliidae
Entolium subdemissum Muenster 1841 scallop
 Ostreida - Bakevelliidae
Bakevellia cf. bouei Hauer 1857 oyster
 Pholadida - Pleuromyidae
Pleuromya cf. elongata Schlotheim 1822 clam
 Cardiida - Anthracosiidae
? Unionites sp. Wissman 1841 clam
Unionites cf. muensteri Wissmann 1841 clam
 Carditida - Myophoricardiidae
Myophoricardium aff. lineatum von Wöhrmann 1889 clam
 Trigoniida - Myophoriidae
Gruenewaldia woehrmanni Bittner 1895 clam
Costatoria sp. Waagen 1907 clam
Crinoidea
 Isocrinida - Pentacrinitidae
Pentacrinus sp. Miller 1821 Sea lily