Itchoda Fm - Amakusa: Late/Upper Eocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Carditida - Crassatellidae
Crassatellites nipponensis
synonym of Crassatella
Bivalvia - Carditida - Carditidae
Venericardia nagaoi
Venericardia nipponica Yokoyama 1911
recombined as Venericardia (Venericor) nipponica
Venericardia mandaica (Yokoyama 1911)
recombined as Venericardia (Venericardia) mandaica
Bivalvia - Pholadomyida - Pholadomyidae
Pholadomya "margaritacea" (Sowerby 1821)
recombined as Pholadomya (Bucardiomya) margaritacea
Bivalvia - Cardiida - Veneridae
Pitar kyushuensis
Bivalvia - Pectinida - Limidae
Lima nishiyamai
Lima kumasoana
Lima amaxensis Yokoyama 1911
see common names

Geography
Country:Japan
Coordinates: 32.4° North, 130.2° East (view map)
Paleocoordinates:39.3° North, 125.4° East
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Paleogene Epoch:Eocene
Stage:Priabonian 10 m.y. bin:Cenozoic 3
Key time interval:Late/Upper Eocene
Age range of interval:37.71000 - 33.90000 m.y. ago
Stratigraphy
Geological group:Sakasegawa Formation:Itchoda
Stratigraphic resolution:group of beds
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Itchoda Fm, which locally overlies the Middle Eocene Toishi Fm, and underlies the Sakasegawa Fm (Late Eocene). THICKNESS: From member within formation that attains a thickness of ~10 m. AGE: Late Eocene, based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: From unknown part of formation in this local area.
Lithology and environment
Primary lithology:glauconitic lithified sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Glauconitic sandstone. LITHIFICATION: Presumed lithified on the basis of age.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Shallow sea, soft-bottom siliciclastic bottom.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:surface (float),field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTOR: A. Mizuno (c. 1964). REPOSITORY: Not stated in text, unknown.
Taxonomic list comments:COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: Farly modern nomenclature, and species-level assignments.
Metadata
Database number:70924
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:M. Uhen Research group:marine invertebrate
Created:2007-04-11 21:10:55 Last modified:2019-08-06 15:21:53
Access level:the public Released:2007-04-11 21:10:55
Creative Commons license:CC BY
Reference information

Primary reference:
23772. A. Mizuno. 1964. Paleogene and Early Neogene molluscan faunae in West Japan. Geological Survey of Japan Report 204 [A. Hendy/A. Hendy]

Secondary references:

61622 T. Nagao. 1928. Palaeogene fossils of the Island of Kyushu, Japan Part I. Science Reports of the Tohoku Imperial University 9(3):97-128 [M. Uhen/B. Shipps/M. Uhen]