Sample LSr-03, lower (downstream) LSr section, Sorachi River: Early Pliocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Ostracoda - Podocopida - Cytheruridae
3 specimens
1 specimen
Ostracoda - Podocopida - Trachyleberididae
18 specimens
Ostracoda - Podocopida - Hemicytheridae
35 specimens
Ostracoda - Podocopida - Pectocytheridae
10 specimens
Ostracoda - Podocopida - Paradoxostomatidae
1 specimen
see common names

Geography
Country:Japan State/province:Hokkaido Region County:Hokkaido Prefecture
Coordinates: 43.6° North, 141.9° East (view map)
Paleocoordinates:43.4° North, 141.0° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Pliocene
Stage: Zanclean 10 m.y. bin: Cenozoic 6
Key time interval: Early Pliocene
Age range of interval: 5.333 - 3.6 m.y. ago
Stratigraphy
Formation:Takikawa Member:Horokura
Stratigraphy comments: "Sample LSr-03 of the Horokura Sandstone and Mudstone Member of the Takikawa Formation (Pliocene)"
Lithology and environment
Primary lithology:gray,blue sandstone
Secondary lithology: gravel
Includes fossils?Y
Lithology description: Lsr is from the medium sandstone layer. "The Lsr section is approximately 4 m thick and consists of well-sorted massive grayish-blue fine-grained sandstone, alternating layers of tuffaceous fine sandstone (~10 cm thick), and a fine-grained granule stone layer (~40 cm thick). In the uppermost part of the section, trough-type cross-lamination is developed in the grayish-blue fine-grained sandstone (~40 cm thick)."
Environment:estuary/bay
Geology comments: "inner area of a bay" in cold water settings
Taphonomy
Modes of preservation:body
Size of fossils:microfossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Database number:278622
Authorizer:P. Novack-Gottshall Enterer:P. Novack-Gottshall
Modifier:P. Novack-Gottshall
Created:2026-04-19 07:30:22 Last modified:2026-04-19 08:02:52
Access level:the public Released:2026-10-19 07:30:22
Creative Commons license:CC0
Reference information

Primary reference:
94627. K. Mukai and G. Tanaka. 2025. Early Pliocene ostracodes from the Takikawa Formation in Hokkaido, northern Japan, and the new genus Woodeltia moving in the North Pacific Ocean. Journal of Paleontology 99(6):1401-1417 [P. Novack-Gottshall/P. Novack-Gottshall]