Ks4003 - 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 unknown position within the Hiraiga Fm.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, fine-grained, nodular, gray, calcareous, carbonaceous sandstone

• SPECIFIC LITHOLOGY: Varicolored, ill-sorted, fine-grained sandstone yielding cobble- to boulder-sized nodules; these nodules consist of calcareous gray fine-grained sandstone with a large amount of stems of crinoids and carbonized plant fragments. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: concretion

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 91301: 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.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Desmoceratidae
Pseudohaploceras nipponicus
Gastropoda
 Cerithioidea - Thiaridae
Pyrgulifera nodosa n. sp.
Pyrgulifera nodosa n. sp. snail
 Sorbeoconcha - Naticidae
Amauropsis importuna
 Trochoidea - Turbinidae
Semisolarium incrassatum, Afrollonia matsushimensis n. sp.
Bivalvia
 Arcida - Glycymerididae
Glycymeris (Hanaia) densilineata
 Trigoniida - Megatrigonioidae
Pterotrigonia sp.
Pterotrigonia sp. van Hoepen 1929 clam
 Cardiida - Veneridae
Nagaoella corrugata
 Carditida - Astartidae
Astarte (Leckhamptonia) subomalioides