Itahana Flora Locality Ia: Tortonian - Messinian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Angiospermae - Moraceae
17 specimens
Angiospermae - Malpighiales - Salicaceae
28 specimens
2 specimens
2 specimens
58 specimens
see common names

Geography
Country:Japan State/province:Gunma
Coordinates: 36.3° North, 139.0° East (view map)
Paleocoordinates:35.9° North, 137.4° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Miocene
Stage: Tortonian - Messinian 10 m.y. bin: Cenozoic 6
*Period:Late/Upper Tertiary *Epoch:Late/Upper Miocene - Early/Lower Pliocene
Key time interval: Tortonian - Messinian
Age range of interval: 11.63 - 5.333 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Tomioka Formation:Itahana
Lithology and environment
Primary lithology: siltstone
Lithology description: This outcrop is stratigraphically situated nearly 25 m above the sediments of Locality G.
Environment:marine indet.
Geology comments: This cliff is consisting of conglomerate, sandstone, siltstone, tuffaceous sandy siltstone and tuff breccia, and is one of the upper members of the Itahana Formation
Taphonomy
Modes of preservation:original carbon
Size of fossils:macrofossils
Temporal resolution:snapshot
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:surface (in situ),field collection
Reason for describing collection:taxonomic analysis
Collection method comments: Siltstone yields Salix occupying about 85% of the total specimens, accompanied by only "Ficus". In the sandy siltstone Quercus occupies nearly half of the total, followed by Bambusites, Phragmites? and Acer. Sandstone abounds in Fagus stuxbergii which takes up 37% accompanied by Carpinus, Zelkova and Acer. No species of evergreen broad leaved trees are found.
Metadata
Database number:21260
Authorizer:H. Sims Enterer:H. Lindon
Modifier:J. Cassara Research group:paleobotany
Created:2002-06-24 06:22:49 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-06-24 06:22:49
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]