Where: Gunma, Japan (36.1° N, 138.9° E: paleocoordinates 46.0° N, 140.9° E)
• coordinate estimated from map
• hand sample-level geographic resolution
When: Lower Member (Sebayashi Formation), Late/Upper Hauterivian to Late/Upper Hauterivian (136.4 - 125.5 Ma)
• "from the lowermost part of the Lower Member of the Sebayashi Formation"
• bed-level stratigraphic resolution
Environment/lithology: estuary or bay; conglomerate and sandstone
• "Locally developed conglomerate beds with erosional bases are interpreted to represent lag deposits. This shows the transgressive shoreface erosion of underlying deposits. The theropod tooth was found in a gravel size clast among shell fragments of brackish water bivalves"
• "collected from a block of poorly sorted conglomerate thought to be derived from the lowermost part of the Lower Member of the Sebayashi Formation. This attribution is because of the typical poorly sorted conglomerates in the coarse grained sandstone: the Sebayashi Formation at the Mamonozawa River is represented by the Lower Member consisting of dark gray fine to medium grained sandstone with thin poorly sorted conglomerate layers, and by the Upper Member of alternating beds of sandstone and mudstone"
Size class: mesofossils
• tooth NDC-P0001
Collected by Y. Watanabe
Collection methods: surface (float)
• Kanna Town Dinosaur Center collection (NDC-P0001)
Primary reference: R. E. Molnar, I. Obata, M. Tanimoto and M. Matsukawa. 2009. A tooth of Fukuiraptor aff. F. kitadaniensis from the Lower Cretaceous Sebayashi Formation, Sanchu Cretaceous, Japan. Bulletin of Tokyo Gakugei University, Division of Natural Sciences 61:105-117 [M. Carrano/M. Oreska]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 97938: authorized by Matthew Carrano, entered by Matthew Oreska on 09.09.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
• "The theropod tooth was found in a gravel size clast among shell fragments of brackish water bivalves, Costocyrena radiatostriata....one vertebra of an ornithomimid identified as Gallimimus sp. by Manabe et al. (1989) and as ornithomimid get. et sp. indet. (Hasegawa et al. 1999), probable dinosuar tracks (Matsukawa and Obata 1985), and a possible spinosaurid tooth (Hasegawa et al., 2003) have been reported from the uppermost part of the Lower Member of the Sebayashi Formation."
Show authors, comments, and common names
| Bivalvia |
| Cardiida - Neomiodontidae |
|
| Reptilia |
| Theropoda - Neovenatoridae |
|