Where: Niigata, Japan (38.0° N, 138.2° E: paleocoordinates 40.5° N, 135.7° E)
• coordinate stated in text
When: Tsurushi Formation, Serravallian (13.8 - 11.6 Ma)
• Radiolarian zones N10 to N13.
Primary reference: L. G. Barnes and K. Hirota. 1995. Miocene pinnipeds of the otariid subfamily Allodesminae in the North Pacific Ocean: Systematics and relationships. The Island Arc 3:329-360 [M. Uhen/M. Uhen]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 59181: authorized by Mark Uhen, entered by Mark Uhen on 20.03.2006
Creative Commons license: CC BY (attribution)