Haipe N - 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 - 112.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Hiraiga Fm. AGE: Late Aptian; justification for age not reported in text. STRATIGRAPHIC POSITION: Probably from the lower part of the Hiraiga Fm.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, fine-grained, shelly/skeletal, calcareous sandstone

• SPECIFIC LITHOLOGY: Highly calcareous and laminated fine-grained sandstone, intercalated by lenticular and aggregated shell-bearing layers. LITHIFICATION: Lithified, on the basis of figured specimens.

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 91296: 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.
Gastropoda
 Trochoidea - Ataphridae
 Trochoidea - Turbinidae
Homalopoma cirrus snail
SUBSPECIES: Homalopoma cirrus nipponicus
 Seguenzioidea - Eucyclidae
 Turbinoidea - Proconulidae
 Epitonioidea - Epitoniidae
 Cerithioidea - Turritellidae
Torquesia yaegashii turret shell
 Cerithioidea - Batillariidae
? Pyrazus sp. Monfort 1810 snail
 Cerithioidea - Cryptaulacidae
 Pseudomelanoidea - Pseudomelaniidae
 Sorbeoconcha - Colombellinidae
"Columbellina (Columbellaria) brevisiphonata" = Colombellina
"Columbellina (Columbellaria) brevisiphonata" = Colombellina snail
 Sorbeoconcha - Aporrhaidae
 Sorbeoconcha - Naticidae
Gyrodes munitus moon snail
 Heterostropha - Ringiculidae
 Heterostropha - Nerinellidae
"Endiatrachelus cf. parallela" = Nerinella parallela
"Endiatrachelus cf. parallela" = Nerinella parallela Anderson and Hanna 1935 snail
Bivalvia
 Cardiida - Veneridae
 Carditida - Astartidae
 Trigoniida - Megatrigonioidae