Akima Flora Locality: Tertiary, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Angiospermae - Fabales - Fabaceae
2 specimens
Angiospermae - Fagales - Fagaceae
283 specimens
Quercus miovariabilis leaf Hu and Chaney 1938
2 specimens
Angiospermae - Saxifragales - Hamamelidaceae
1 specimen
Angiospermae - Cornales - Cornaceae
4 specimens
Angiospermae - Myrtales - Trapaceae
11 specimens
12 specimens
12 specimens
Angiospermae - Alismatales - Potamogetonaceae
50 specimens
unclassified
1 specimen
see common names

Geography
Country:Japan State/province:Gunma
Coordinates: 36.0° North, 139.0° East (view map)
Paleocoordinates:40.5° North, 135.3° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Time
10 m.y. bin: Cenozoic 1-6
*Period:Late/Upper Tertiary
Key time interval: Tertiary
Age range of interval: 66 - 2.58 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Akima
Stratigraphy comments: The relationship between the Akima and underlying Itahana Formations is considered to be a parallel unconformity by Akima Collaborative Research Group (1971).
Lithology and environment
Primary lithology:fine,tuffaceous siltstone
Includes fossils?Y
Lithology description: The Akima Formation consisting chiefly of volcanic flow deposits and pyroclastics locally yields some plant fossils...The Akima flora occurs in a fine-grained tuffaceous siltstone intercalated in the thick volcanic flow deposits.
Environment:lacustrine indet.
Geology comments: Fossil diatoms indicating stagnant fresh water condition were reported from the formation...It seems to represent one of the cool temperate deciduous forest around a dammed lake.
Taphonomy
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection excludes:all microfossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:22768
Authorizer:H. Sims Enterer:H. Lindon, J. Cassara
Modifier:J. Cassara Research group:paleobotany
Created:2002-06-25 10:59:06 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-06-25 10:59:06
Creative Commons license:CC0
Reference information

Primary reference:
6513. K. Ozaki. 1991. Late Miocene and Pliocene Floras in Central Honshu, Japan. Bulletin of Kanagawa Prefectural Museam Natural Science Special Issue 1-244 [H. Sims/H. Lindon/H. Lindon]