Ks7004 - Miyako area [Aketo Fm] (Cretaceous of Japan)

Where: Japan (39.9° N, 141.9° E: paleocoordinates 54.1° N, 138.7° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Aketo Formation, Early/Lower Albian (112.0 - 109.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Aketo Fm. AGE: Lower Albian. STRATIGRAPHIC POSITION: Probably from lower part of the Aketo Fm.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, fine-grained, concretionary, nodular, brown, calcareous sandstone

• SPECIFIC LITHOLOGY: Weathered, calcareous, brown-colored and very fine-grained sandstone with frequent intercalations of lenticular sandstone beds which yield abundant stems of frinoid and spines or echinoderms; sandstone also yields various-shaped calcareous fossiliferous nodules. 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 91255: 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 - Turbinidae
Semisolarium incrassatum
Bivalvia
 Carditida - Astartidae
Astarte (Freiastarte) subomalioides, Eriphyla pulchella
 Trigoniida - Megatrigonioidae
Pterotrigonia sp.
Pterotrigonia sp. van Hoepen 1929 clam
 Ostreida - Gryphaeidae
? Pycnodonte sp.
? Pycnodonte sp. Fischer von Waldheim 1835 oyster
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily