Ks7003 - 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: Lower cycle of the lower part of the Hiraiga Fm.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, bioturbated, medium-grained, nodular, calcareous sandstone and lithified, fine-grained, silty sandstone

• SPECIFIC LITHOLOGY: Bioturbated and calcareous medium-grained sandstone about 80 cm in thickness, interbedded between upper silty fine-grained sandstone and lower coquinal sandstone; traces of crawling or unidentified organisms abundantly occur along with stratification. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Collected by Kase

• COLLECTOR: 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 91256: authorized by Austin Hendy, entered by Austin Hendy on 13.09.2009

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.
Show authors, comments, and common names
Gastropoda
 Trochoidea - Nododelphinulidae
Nododelphinula hiraigensis n. sp.
 Trochoidea - Turbinidae
Semisolarium incrassatum
Bivalvia
 Carditida - Astartidae
Astarte (Trautscholdia) minor
 Trigoniida - Megatrigonioidae
Pterotrigonia hokkaidoana