Central Shikoku (32626): Berriasian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Cardiida - Cardiidae
Bivalvia - Lucinida - Lucinidae
Bivalvia - Venerida - Arcticidae
2 specimens
Bivalvia - Trigoniida - Megatrigoniidae
4 specimens
Bivalvia - Arcida - Cucullaeidae
1 specimen
Bivalvia - Arcida - Parallelodontidae
1 specimen
Bivalvia - Mytilida - Mytilidae
3 specimens
Bivalvia - Limida - Limidae
3 specimens
Bivalvia - Ostreida - Bakevelliidae
see common names

Geography
Country:Japan
Coordinates: 33.7° North, 133.8° East (view map)
Paleocoordinates:49.6° North, 140.0° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Early Cretaceous
Stage: Berriasian 10 m.y. bin: Cretaceous 1
Key time interval: Berriasian
Age range of interval: 143.1 - 137.05 m.y. ago
Stratigraphy
Formation:Birafu Member:B1
Local order:no particular order
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: lithified "limestone"
Secondary lithology: lithified sandstone
Lithology description: The bivalve yielding Member B1 consists of conglomerate, sandstone, mudstone, limestone and alternating beds of sandstone and mudstone. The conglomerate contains chert, shale and granite pebbles. The medium grained poorly sorted sandstone beds contain coaly inclusions and abundant nonmarine and marine mollusks. Limestone beds are ooliticpeloidal and bioclastic grainstones (Morino, 1993). This unit is approximately 170 m thick.
Environment:slope
Taphonomy
Modes of preservation:body,mold/impression
Size of fossils:macrofossils,microfossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:116558
Authorizer:M. Aberhan Enterer:D. Wellmanns
Modifier:D. Wellmanns Research group:marine invertebrate
Created:2011-09-09 01:08:10 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2016-09-09 01:08:10
Creative Commons license:CC0
Reference information

Primary reference:
37488. T. Kozai, K. Ishida, and Y. Kondo. 2006. Radiolarians, bivalves and the J/K boundary in the Birafu Formation, southern Kurosegawa Belt, Central Shikoku, SW Japan. Geosciences Journal 10(3):217-235 [M. Aberhan/D. Wellmanns]