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

Rhynchonellata
 Terebratulida - Terebrataliidae
Terebratalia tenuis Hayasaka 1922
Terebratalia gouldii Dall 1891
ssp. ugoensis
Coptothyris grayi Davidson 1852
 Terebratulida - Zeilleriidae
Macandrevia nipponica n. sp. Nomura and Hatai 1936
 Terebratulida - Cancellothyrididae
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. Nomura and Hatai 1936