Hn0017 - Miyako area [Hiraiga Fm]: Late Aptian, Japan
collected by Hanai & Hanai

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Crinoidea
Crinoidea indet. Miller 1821
Gastropoda - Ampullinidae
Gastropoda - Cryptaulacidae
Gastropoda - Turritellidae
Gastropoda - Trajanellidae
Gastropoda - Tylostomatidae
Gastropoda - Naticidae
Euspira sp. Agassiz 1837
Gastropoda - Bursidae
Gastropoda - Procerithiidae
Gastropoda - Eucyclidae
Gastropoda - Chilodontaidae
Gastropoda - Nododelphinulidae
Gastropoda - Ataphridae
Gastropoda - Turbinidae
Gastropoda - Cycloneritida - Neritopsidae
Neritopsis sp. Grateloup 1832
Gastropoda - Neritidae
Gastropoda - Neridomidae
Gastropoda - Heterostropha - Ringiculidae
Bivalvia - Arcida - Cucullaeidae
Bivalvia - Venerida - Veneridae
Bivalvia - Carditida - Astartidae
see common names

Geography
Country:Japan
Coordinates: 39.9° North, 141.9° East (view map)
Paleocoordinates:48.2° North, 151.2° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Early Cretaceous
10 m.y. bin: Cretaceous 2-3
Key time interval: Late Aptian
Age range of interval: 119.57 - 113.2 m.y. ago
Stratigraphy
Formation:Hiraiga
Stratigraphic resolution:bed
Stratigraphy comments: 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.
Lithology and environment
Primary lithology:fine,shelly/skeletal lithified calcareous sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Highly calcareous and very fine-grained sandstone. LITHIFICATION: Lithified, on the basis of figured specimens.
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Articulated whole bodies:some
Disassociated major elements:many
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collectors:Hanai & Hanai
Collection method comments: COLLECTOR: T. Hanai and I. Hanai. REPOSITORY: Not stated in text.
Taxonomic list comments:COVERAGE: Exhaustive for gastropods; other taxa (namely bivalves and foraminifera) often present. NOMENCLATURE: Authoritative publication, with relatively modern nomenclature, and species-resolution identifications.
Metadata
Database number:91286
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2009-09-14 09:20:04 Last modified:2025-02-22 15:12:02
Access level:the public Released:2009-09-14 09:20:04
Creative Commons license:CC0
Reference information

Primary reference:
30704. T. Kase. 1984. Early Cretaceous marine and brackish-water Gastropoda from Japan 1-262 [A. Hendy/A. Hendy]