Sea coast west of Ibaruma, Ishigaki-jima Island: Priabonian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Turbinidae
Gastropoda - Turritellidae
Gastropoda - Potamididae
Gastropoda - Naticidae
Euspira sp. Agassiz 1837
Gastropoda - Neogastropoda - Terebridae
Gastropoda - Neogastropoda - Buccinidae
Buccinidae indet. Rafinesque 1815
Gastropoda - Neogastropoda - Volutidae
Gastropoda - Opisthobranchiata - Cylichnidae
Scaphander sp. Monfort 1810
Bivalvia - Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758
Bivalvia - Limida - Limidae
Lima sp. Bruguière 1797
Bivalvia - Venerida - Veneridae
Veneridae indet. Rafinesque 1815
Cephalopoda - Nautilida - Nautilidae
Cephalopoda - Nautilida - Aturiidae
see common names

Geography
Country:Japan
Coordinates: 24.5° North, 124.3° East (view map)
Paleocoordinates:
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Eocene
Stage: Priabonian 10 m.y. bin: Cenozoic 3
Key time interval: Priabonian
Age range of interval: 37.71 - 33.9 m.y. ago
Stratigraphy
Formation:Miyara
Stratigraphic resolution:group of beds
Stratigraphy comments: The Miyara Formation (same as the Miyaragawa Formation) consists essentially of reefal limestone containing Priabonian larger foraminifera such as Nummulites saipanensis, Pellatispira madraszi, and so on.
Lithology and environment
Primary lithology:pebbly lithified sandstone
Lithology description: Granular to pebbly sandstone
Environment:shoreface
Geology comments: According to Foster (1965): Interbedded conglomerate and sandstones west of Ibaruma contains rock fragments typically 0.6-6 cm, but up to 16 cm in size; along with obscure crossbedding. Material composing the conglomerates was derived locally from the metamorphic rocks of the Ishigaki Group. Likely deposited around the margins of the then-existing island or islands on submarine shelves or floors composed of the metamorphic rocks of the Ishigaki Group.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: National Science Museum, Tokyo
Metadata
Database number:179914
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2016-07-03 20:13:36 Last modified:2025-02-22 15:12:02
Access level:the public Released:2016-07-03 20:13:36
Creative Commons license:CC0
Reference information

Primary reference:
59681. H. Noda, H. Nakagawa, N. Doi and Y. Kikuchi. 2001. First occurrence of Eocene nautilids from the Miyaragawa Formation in Ishigaki-jima Island the Ryukyus, southwest Japan. Bulletin of the National Science Museum, Tokyo, Series C 27:89-100 [M. Clapham/M. Clapham]