IGPS N-5, Chiyo Primary School (Miocene of Japan)

Where: Japan (35.4° N, 137.9° E: paleocoordinates 39.1° N, 135.2° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Yonekawa Formation (Tomikusa Group), Burdigalian (20.4 - 16.0 Ma)

• "middle part of the Yonekawa Formation". Diatom assemblages are characterized by abundant occurrences of Kisseleviella carina and Stephanopyxis spp. The presence of Crucidenticula sawamurae, C. ikebei, Delphineis kamenooensis and D. miocenica, and the absence of Crucidenticula kanayae suggest that the unit is placed within the middle to upper part of the C. sawamurae zone (late Early Miocene) (Ito et al., 1999).

Environment/lithology: coastal; lithified, massive, fine-grained, brown, gray siltstone

• The lithology of the slab bearing the fossil crab, is dark brownish gray fine siltstone. Laminations are indistinct and perhaps very thin, about 2 mm. thick. Between the natural parting, the rock is massive and had concoidal fracture.

Size class: macrofossils

Primary reference: R. Imaizumi. 1957. A Miocene fossil crab, Paratymolus yabei n. sp. from Nagano Prefecture. Transactions and Proceedings of the Paleontological Society of Japan, N.S. 25:26-30 [C. Schweitzer/L. Baltzly/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 169964: authorized by Carrie Schweitzer, entered by Lerin Baltzly on 06.06.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Malacostraca
 Decapoda - Macrocheiridae
"Paratymolus yabei n. sp." = Macrocheira yabei
"Paratymolus yabei n. sp." = Macrocheira yabei Imaizumi 1957 spider crab