Oj0406 - Miyako area [Hiraiga Fm] (Cretaceous of Japan)

Where: Japan (39.8° N, 141.9° E: paleocoordinates 53.0° 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 the basal part of the Hiraiga Fm; 40 cm thick; superposed on sandstone of the Tanohata Fm.

• bed-level stratigraphic resolution

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

• SPECIFIC LITHOLOGY: Nodular, highly calcareous and compact fine-grained sandstone, contains skeletal debris. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: concretion

Collected by Oji & Kase

• COLLECTOR: T. Oji 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 91310: 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
 Trigoniida - Trigoniidae
Nipponitrigonia kikuchiana Yokoyama 1891 clam
 Trigoniida - Megatrigonioidae
Pterotrigonia sp. van Hoepen 1929 clam
 Mytilida - Mytilidae
Mytilus sp. Linnaeus 1758 mussel
Gastropoda
 Cycloneritida - Symmetrocapulidae
 Sorbeoconcha - Procerithiidae
? Cimolithium miyakoense Nagao 1934 snail
 Neritoidea - Neritidae
 Trochoidea - Ataphridae
 Pleurotomarioidea - Pleurotomariidae
 Patellogastropoda - Patellidae
Patella miyakoensis n. sp. limpet
 Patellida - Acmaeidae