Where: Japan (45.4° N, 142.0° E: paleocoordinates 54.8° N, 135.3° E)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Chenaibo Formation (Middle Yezo Group), Cenomanian (100.5 - 93.9 Ma)
• bed-level stratigraphic resolution
Environment/lithology: marine; shale
Size classes: macrofossils, microfossils
Preservation: concretion
Primary reference: I. Obata, Y. Kawashita, S. Maiya, Y. Taketani, M. Futakami and T. Suzuki. 1989. An Upper Cretaceous plesiosaur (Family Elasmosauridae) from the Wakkanai area Hokkaido. Bulletin of the National Science Museum, Series C: Geology, Tokyo 15(1):25-31 [J. Alroy/R. Whatley/M. Carrano]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 28176: authorized by John Alroy, entered by Erin Leckey on 27.01.2003
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Nodosariata | |
"Oolina apiculata" = Lagena apiculata, Dentalina basiplanata, Dentalina megaropolitana, Dentalina sp., Dentalina catenula
"Oolina apiculata" = Lagena apiculata Reuss 1850
Dentalina sp. d'Orbigny 1826
Dentalina catenula Reuss 1860 | |
Palmula sp. Lea 1833 | |
Globothalamea | |
Gyroidina globosa rumoiensis d'Orbigny 1826 | |
Foraminifera | |
"Hedbergella delrioensis" = Globigerina delrioensis
"Hedbergella delrioensis" = Globigerina delrioensis Carsey 1954 | |
Protozoa | |
Novixitus weyli Schmidt-Effing 1980 radiolarian | |
Pseudodictyomitra pentacolaensis radiolarian
Pseudodictyomitra pseudomacrocephala Squinabol 1903 radiolarian | |
Stichomitra ? euganea radiolarian | |
Sethocapsa simplex Taketani 1982 radiolarian | |
Holocryptocanium geysersense radiolarian
Holocryptocanium barbui Dumitrica 1970 radiolarian | |
Squinabollum fossilis radiolarian | |
Thanarla elegantissima Cita 1964 radiolarian |