Loc. 1 [Ishiizawa Fm]: Middle Miocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Venerida - Veneridae
2 individuals
Bivalvia - Venerida - Mactridae
8 individuals
Bivalvia - Arcida - Glycymerididae
17 individuals
Gastropoda - Calyptraeidae
Crepidula cf. grandis Middendorf 1849
1 individual
Gastropoda - Naticidae
Naticidae indet. Guilding 1834
1 individual
see common names

Geography
Country:Japan
Coordinates: 42.9° North, 143.8° East (view map)
Paleocoordinates:42.8° North, 141.0° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period: Neogene Epoch: Miocene
10 m.y. bin: Cenozoic 5
Key time interval: Middle Miocene
Age range of interval: 15.98 - 11.63 m.y. ago
Stratigraphy
Formation:Ishiizawa
Stratigraphic resolution:formation
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Ishiizawa Fm, which unconformably overlies the Tokomuro Fm (Middle Miocene). AGE: Middle Miocene on the basis of molluscan biostratigraphy. Approximately correlated with the lower part of the Togeshita Formation. STRATIGRAPHIC POSITION: From unknown position in regional section.
Lithology and environment
Primary lithology: poorly lithified "siliciclastic"
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Unknown, but certainly siliciclastic. LITHIFICATION: Poorly-lithifed on the basis of figured specimens.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Coastal marine, siliciclastic environment.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:medium
Collection methods and comments
Collection methods:field collection
Reason for describing collection:paleoecologic analysis
Collection method comments: COLLECTOR: Presumably K. Amano (c. 1980's). REPOSITORY: Joetsu University of Education, Japan (JUE)
Taxonomic list comments:COVERAGE: Exhaustive for gastropoda, bivalvia and scaphopoda. NOMENCLATURE: Authoritative publication, using moderately recent nomenclature, subgenus and species level designations.
Metadata
Database number:81700
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2008-07-11 20:13:10 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2009-07-11 20:13:10
Creative Commons license:CC0
Reference information

Primary reference:
27590. K. Amano. 1986. Age and characteristics of the so-called "Atsunai-Togeshita fauna" in Hokkaido. Paleontological Society of Japan Special Papers 29:187-198 [A. Hendy/A. Hendy]