Where: Japan (44.2° N, 142.1° E: paleocoordinates 53.6° N, 135.8° E)
• coordinate estimated from map
• small collection-level geographic resolution
When: Early/Lower Cenomanian (99.7 - 94.3 Ma)
• Although the exact stratigraphic horizon from which the concretion came is uncertain, judging from its location, it without doubt came from the mudstone of the Member My3 of the "Middle Yezo Group," which can be correlated with the Graysonites adkinsi-G. wooldridgei zone (=lowest Cenomanian).
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified, concretionary mudstone
Size class: macrofossils
Collection methods: Repository: Institute of Geoscience, University of Tsukuba, Tsukuba.
Primary reference: Y. Shigeta. 2013. A new species of Tanabeceras (Ammonoidea, Gaudryceratidae) from the lowest Cenomanian of Hokkaido, Japan. Paleontological Research 17:312-316 [M. Clapham/M. Clapham] more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 174600: authorized by Matthew Clapham, entered by Matthew Clapham on 16.11.2015
Creative Commons license: CC BY (attribution)