Iwaizawa, Yazawagi-mura (Miocene of Japan)

Where: Japan (39.3° N, 140.4° E: paleocoordinates 41.9° N, 137.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Sugota Formation, Serravallian (13.8 - 11.6 Ma)

• From the middle or possibly lower part of the Sugota beds. Sugota Formation contains diatoms of zones NPD 5A and 5B, indicating Serravallian age.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; unlithified, coarse-grained, muddy sandstone

• "Probably in the range of 30-50 fathoms
• Muddy sandstone, rather loose in texture and coarse grained in part.

Size class: macrofossils

Collection methods: Repository: Saito Ho-on Museum

Primary reference: K. M. Hatai. 1940. The Cenozoic Brachiopoda of Japan. Science Reports, Tohoku Imperial University, Series 2 20:1-413 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 190741: authorized by Matthew Clapham, entered by Matthew Clapham on 16.12.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Terebratulida - Terebrataliidae
Terebratalia tenuis, Terebratalia gouldii, Coptothyris grayi
Terebratalia tenuis Hayasaka 1922
Terebratalia gouldii Dall 1891
ssp. ugoensis
Coptothyris grayi Davidson 1852
 Terebratulida - Zeilleriidae
Macandrevia nipponica n. sp.
Macandrevia nipponica n. sp. Nomura and Hatai 1936
 Terebratulida - Cancellothyrididae
Terebratulina tohokuensis, Terebratulina honsyuensis n. sp., Terebratulina akitana n. sp., Terebratulina japonica
Terebratulina tohokuensis Nomura and Hatai 1936
Terebratulina honsyuensis n. sp. Nomura and Hatai 1936
Terebratulina akitana n. sp. Nomura and Hatai 1936
Terebratulina japonica Sowerby 1846
 Rhynchonellida - Hemithirididae
Hemithyris peculiaris n. sp.
Hemithyris peculiaris n. sp. Nomura and Hatai 1936