Kitakoyama boulder (Pliocene of Japan)

Also known as T. miensis type site

Where: Mie, Japan (34.8° N, 136.4° E: paleocoordinates 35.3° N, 135.8° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Kameyama Formation (Agé Group), Late/Upper Pliocene (3.6 - 2.6 Ma)

• derivation from lower part of the Kameyama Formation is probable but not certain. Horizon considered to be the Stegodon elephantoides zone.

• member-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; fine-grained, gray, blue siltstone

• "fresh water" deposition based on gastropod fauna
• "The matrix containing the skull is bluish grey silt to fine-grained sand and is easily dispersed in water."

Size classes: macrofossils, mesofossils

Collected in 1971

Collection methods: surface (float),

Primary reference: Y. Okazaki and S. Yoshida. 1977. On a new fossil Trionyx from the Pliocene Age Group, Mie Prefecture, West Japan. Bulletin of the Mizunami Fossil Museum 4:87-95 [M. Carrano/M. Carrano/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 34496: authorized by Matthew Carrano, entered by Matthew Carrano on 03.09.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Architaenioglossa - Viviparidae
Viviparus sp. Montfort 1810 snail
 Testudines - Trionychidae
Trionyx miensis n. sp. Okazaki and Yoshida 1977 softshell turtle
 Pinales - Pinaceae
Pinus sp. Linnaeus 1753 pine
 Pinales - Taxodiaceae
Taxodiaceae indet. Saporta 1865
 Theales - Dilleniidae
Ilex sp. Linnaeus
 Juglandales - Hamamelidae
Juglans sp. Linnaeus 1753 walnut
 Ericales - Ericaceae
Ericaceae indet. de Jussieu 1789
 Malvales - Tiliaceae
Tilia sp. Linnaeus 1753 linden
 Fagales - Betulaceae
Alnus sp. Miller 1768 alder