Where: Japan (39.9° N, 141.9° E: paleocoordinates 53.1° N, 140.9° E)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Hiraiga Formation, Late/Upper Aptian (122.5 - 113.0 Ma)
• STRATIGRAPHIC RELATIONS: From the Hiraiga Fm. AGE: Late Aptian; justification for age not reported in text. STRATIGRAPHIC POSITION: From the lower part of the lower cycle of the Hiraiga Fm.
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified, fine-grained sandstone
Size class: macrofossils
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 91293: authorized by Austin Hendy, entered by Austin Hendy on 14.09.2009
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Neritopsis tanohatensis snail | |
Tylostoma miyakoense snail | |
Hanaibursa aquilana frog shell | |
Amauropsis importuna moon snail | |
"Acrisa (Hemiacirsa) miyakoensis" = Acirsa (Hemiacirsa)
"Acrisa (Hemiacirsa) miyakoensis" = Acirsa (Hemiacirsa) wentletrap | |
Bathraspira excavata snail | |
Chilodonta cf. antiqua snail | |
Discotectus crassus top snail | |
Nododelphinula hiraigensis n. sp.
Nododelphinula hiraigensis n. sp. snail | |
Bivalvia | |
Anthozoa | |
Anthozoa indet. Ehrenberg 1834 |