Kaizawa Valley (Triassic of Japan)

Where: Tokyo-to, Japan (35.0° N, 139.0° E: paleocoordinates 35.0° N, 115.6° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Iwai Formation, Smithian (251.3 - 247.2 Ma)

• The ammonoids are listed as Meekoceras Zone (=Smithian)

• group of beds-level stratigraphic resolution

Environment/lithology: lenticular, black shale

• black shale. Lowe fossil bed occurs about 2m above base of the upper member (unit d) , where the fossils occur in lenses of black limestone. The upper fossil bed is 17m above the lower fossil bed and consists of marl lenses.

Size class: macrofossils

Reposited in the MCZ

Collection methods: surface (in situ),

• Some specimens are held at Tokyo University of Education

Primary reference: B. Kummel and S. Sakagami. 1960. Mid-Scythian Ammonites from Iwai Formation, Japan. Breviora 126:1-11 [A. McGowan/A. McGowan/A. McGowan]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 44043: authorized by Alistair McGowan, entered by Alistair McGowan on 31.08.2004, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ceratitida - Paranannitidae
"Owenites shimizui" = Owenites koeneni
"Owenites shimizui" = Owenites koeneni Hyatt and Smith 1905 ceratite
 Ceratitida - Meekoceratidae
Juvenites sinuosus
Juvenites sinuosus Kiparisova 1947 ceratite
 Ceratitida - Aspenitidae
Aspenites sp.
Aspenites sp. Hyatt and Smith 1905 ceratite
 Ceratitida - Melagathiceratidae
Paranannites sp.
Paranannites sp. Hyatt and Smith 1905 ceratite
 Ceratitida - Dieneroceratidae
Dieneroceras sp., "Dieneroceras iwaiense" = Dieneroceras dieneri
Dieneroceras sp. Spath 1934 ceratite
"Dieneroceras iwaiense" = Dieneroceras dieneri Hyatt and Smith 1905 ceratite