Hn0914 - Miyako area [Hiraiga Fm] (Cretaceous of Japan)

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; from sandstone 40 cm thick.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, silty, carbonaceous sandstone and lithified, fine-grained sandstone

• SPECIFIC LITHOLOGY: Varicolored silty fine-grained sandstone, interbedded between laminated fine-grained sandstone beds, contains carbonaceous matter. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Collected by Hanai

• COLLECTOR: T. Hanai. 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 91292: authorized by Austin Hendy, entered by Austin Hendy on 14.09.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropods; other taxa (namely bivalves and foraminifera) often present. NOMENCLATURE: Authoritative publication, with relatively modern nomenclature, and species-resolution identifications.
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Gastropoda
 Trochoidea - Turbinidae
Semisolarium incrassatum
 Sorbeoconcha - Tylostomatidae
Tylostoma miyakoense
Bivalvia
 Arcida - Cucullaeidae
Cucullaea (Idonearca) acuticarinata