Hn0017 - 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: From the middle part of the lower cycle of the Hiraiga Fm.

• bed-level stratigraphic resolution

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

• SPECIFIC LITHOLOGY: Highly calcareous and very fine-grained sandstone. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Collected by Hanai & Hanai

• COLLECTOR: T. Hanai and I. 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 91286: 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.
Bivalvia
 Arcida - Cucullaeidae
 Carditida - Astartidae
 Cardiida - Veneridae
Gastropoda
 Neritoina - Neritopsidae
Neritopsis sp. Grateloup 1832 snail
 Architaenioglossa - Ampullinidae
 Prosobranchia - Trajanellidae
 Stromboidea - Tylostomatidae
 Naticoidea - Naticidae
Euspira sp. Agassiz 1837 moon snail
Gyrodes munitus moon snail
Gyrodes nagaoi n. sp. moon snail
 Tonnoidea - Bursidae
 Sorbeoconcha - Turritellidae
Torquesia yaegashii turret shell
 Sorbeoconcha - Procerithiidae
 Heterostropha - Ringiculidae
 Neritoidea - Neritidae
 Neritoidea - Neridomidae
"Neritoma (Neridomus) cf. dolichostoma" = Neridomus
"Neritoma (Neridomus) cf. dolichostoma" = Neridomus snail
 Amberleyoidea - Nododelphinulidae
 Turbinoidea - Turbinidae
 Seguenzioidea - Eucyclidae
 Seguenzioidea - Calliotropidae
 Seguenzioidea - Chilodontidae
 Trochoidea - Trochidae
 Trochoidea - Ataphridae
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily