MJ-2c - Maéjima Fm: Late Eocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Ostreida - Malleidae
Isognomon (Hippochaeta) hataii (Noda and Furuichi 1972)
2 specimens
Bivalvia - Mytilida - Mytilidae
4 specimens
Bivalvia - Pectinida - Pectinidae
2 specimens
see common names

Geography
Country:Japan
Coordinates: 34.6° North, 134.2° East (view map)
Paleocoordinates:39.1° North, 130.3° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period: Paleogene Epoch: Eocene
Stage: Priabonian 10 m.y. bin: Cenozoic 3
Key time interval: Late Eocene
Age range of interval: 37.71 - 33.9 m.y. ago
Stratigraphy
Formation:Maéjima
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Maéjima Fm (also referred to as Maeshima Fm) overlies pre-Tertiary plutonic rocks. THICKNESS: From bed of less than 1 m in thickness within 15 m thick section. AGE: Poorly constrained and debated, although a range of evidence points to a Late Eocene age. Sr isotopes suggest an age of Eocene or older, while foraminiferal and molluscan biostratigraphy points to an Eocene, possibly Late Eocene age. For a long time the Maéjima Fm was considered to be Miocene in age. STRATIGRAPHIC POSITION:From horizon within in the upper part of lower member of the Maéjima Fm.
Lithology and environment
Primary lithology: poorly lithified conglomerate
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Cobble-boulder conglomerate. LITHIFICATION: Poorly-lithified on the basis figured specimens and taphonomic comments.
Environment:shoreface
Geology comments: ENVIRONMENT: Littoral-upper sublittoral gravelly to rocky bottom. TEMPERATURE: Warm-waters.
Taphonomy
Modes of preservation:body,cast,mold/impression,original calcite
Size of fossils:macrofossils
Preservation of anatomical detail:poor
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:bulk,field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTOR: T. Matsubara. REPOSITORY: Museum of Nature and Human Activies, Hyogo, Sanda, Japan.
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Authoritative publication with current nomenclature, and species/subgenus-level assignments.
Metadata
Database number:70911
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-11 19:18:31 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2008-04-11 19:18:31
Creative Commons license:CC0
Reference information

Primary reference:
23780. T. Matsubara. 2002. Molluscan fauna of the "Miocene" Maéjima Formation in Maéjima Island, Okayama Prefecture, southwest Japan. Paleontological Research 6(2):127-145 [A. Hendy/A. Hendy]