Hidakagawa River, loc. 1 and 2 (Cretaceous of Japan)

Where: Wakayama, Japan (33.9° N, 135.2° E: paleocoordinates 42.6° N, 124.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Disrupted Sandstone and Shale Member (Ryujin Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (siliceous); lithified mudstone and lithified sandstone

• mudstone-dominant alternating beds of mudstones and sandstones

Size class: microfossils

Primary reference: T. Tokiwa, Y. Mori, and H. Suzuki. 2005. Cretaceous radiolarian fossils from the Ryujin Formation of the Shimanto Belt in the Kawabe area, Wakayama Prefecture, southwest Japan. Journal of Earth and Planetary Sciences 52:11-23 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 95764: authorized by Wolfgang Kiessling, entered by Uta Merkel on 27.04.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Protozoa
 Nassellaria - Lithocampida
Lithocampe wharanui
 Nassellaria - Xitidae
Xitus grandis
Xitus grandis radiolarian
 Nassellaria - Archaeodictyomitridae
Archaeodictyomitra sp., Archaeodictyomitra squinaboli, Dictyomitra sp., Dictyomitra multicostata, Dictyomitra formosa
Archaeodictyomitra sp. Pessagno 1977 radiolarian
Dictyomitra sp. Zittel 1876 radiolarian
Dictyomitra multicostata Zittel 1876 radiolarian
Dictyomitra formosa Squinabol 1904 radiolarian
 Nassellaria - Amphipyndacidae
Amphipyndax pseudoconulus, Amphipyndax strekta, Amphipyndax stocki
Amphipyndax strekta radiolarian
Amphipyndax stocki Campbell and Clark 1944 radiolarian
 Spumellaria - Pseudoaulophacidae
Alievium sp., Pseudoaulophacus sp.
Alievium sp. Pessagno 1972 radiolarian
Pseudoaulophacus sp. Pessagno 1963 radiolarian
 Spumellaria - Patulibracchiidae
Patulibracchium sp.
Patulibracchium sp. Pessagno 1971 radiolarian