Where: Japan (39.8° N, 142.0° E: paleocoordinates 53.0° N, 141.0° E)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Hiraiga Formation, Late/Upper Aptian (122.5 - 112.0 Ma)
• STRATIGRAPHIC RELATIONS: From the Hiraiga Fm. AGE: Late Aptian; justification for age not reported in text. STRATIGRAPHIC POSITION: From the lower part within the Hiraiga Fm.
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified, fine-grained, nodular, calcareous, carbonaceous sandstone
Size class: macrofossils
Preservation: concretion
Collected by Hanai & Kase
• COLLECTOR: T. Hanai and T. Kase. REPOSITORY: Not stated in text.
Primary reference: T. Kase. 1984. Early Cretaceous marine and brackish-water Gastropoda from Japan 1-262 [A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 91303: authorized by Austin Hendy, entered by Austin Hendy on 14.09.2009
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Cephalopoda | |
Eodouvilleiceras matsumotoi ammonite | |
Gastropoda | |
Afrollonia matsushimensis n. sp.
Afrollonia matsushimensis n. sp. snail | |
Shikamacirrus nipponicus n. gen. n. sp.
Shikamacirrus nipponicus n. gen. n. sp. snail | |
? Acteon sp. Montfort 1810 snail | |
Eriptycha minima snail | |
Bivalvia | |
Bakevellia pseudorostrata oyster | |
Nagaoella corrugata venus clam | |