Sa 203, Sanchu area, upper Ishido Formation, Gunma: Late/Upper Barremian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Hydrozoa - Hydroida - Chondroplidae
Palaelophacmaea annulata
Cephalopoda - Phylloceratida - Phylloceratidae
? Calliphylloceras sp. Spath 1927
Phyllopachyceras aff. infundibulum (d'Orbigny 1840)
Cephalopoda - Ammonitida - Bochianitidae
? Kabylites sp. Durand Delga 1954
Cephalopoda - Ammonitida - Desmoceratidae
Barremites (Barremites) sp.
Barremites (Barremites) aff. difficilis (d'Orbigny 1840)
Barremites (Barremites) aff. strettostoma (Uhlig 1883)
recombined as Barremitites strettostoma
? Pseudohaploceras otsukai
Cephalopoda - Ammonitida - Ancyloceratidae
Acrioceras aff. tabarelli (Astier 1851)
Cephalopoda - Ammonitida - Heteroceratidae
Heteroceras sp. d'Orbigny 1849
? Heteroceras sp. d'Orbigny 1849
Cephalopoda - Ammonitida - Acrioceratidae
? Hamiticeras sp. Anderson 1938
? Lytocrioceras furcatum
? Lytocrioceras sp.
Cephalopoda - Ammonitida - Oppeliidae
Aconeceras sp. Hyatt 1903
Cephalopoda - Hamulinidae
Anahamulina sp. Hyatt 1900
Anahamulina aff. subcylindrica (d'Orbigny 1850)
Cephalopoda - Nautilida - Nautilidae
Cymatoceras aff. neocomiensis (d'Orbigny 1840)
recombined as Cymatoceras neocomiense
Cephalopoda - Nautilida - Cenoceratidae
Heminautilus japonicus n. sp. Baudouin et al. 2016
Baudouin et al. 2016
Heminautilus cf. H. lallierianus in Obata et al., 1984 (1 measurement)
see common names

Geography
Country:Japan
Coordinates: 36.1° North, 138.8° East (view map)
Paleocoordinates:46.6° North, 140.8° East
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Barremian 10 m.y. bin:Cretaceous 2
Key time interval:Late/Upper Barremian
Age range of interval:130.00000 - 125.45000 m.y. ago
Stratigraphy
Formation:Ishido
Stratigraphic resolution:group of beds
Stratigraphy comments: upper Ishido Formation
Lithology and environment
Primary lithology: lithified calcareous sandstone
Lithology description: very fine-grained calcareous sandstone
Environment:coastal indet.
Glacial or sequence phase:transgressive
Taphonomy
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:66079
Authorizer:W. Kiessling, M. Clapham Enterer:U. Merkel, M. Clapham
Research group:marine invertebrate
Created:2006-09-28 05:01:16 Last modified:2006-09-28 08:01:16
Access level:the public Released:2006-09-28 05:01:15
Creative Commons license:CC BY
Reference information

Primary reference:

18928. G. D. Stanley, Jr. and Y. Kanie. 1985. The first mesozoic chondrophorine (medusoid hydrozoan) from the Lower Cretaceous of Japan. Palaeontology 28(1):101-109 [W. Kiessling/U. Merkel]

Secondary references:

60020 C. Baudouin, G. Delanoy, J. A. Moreno-Bedmar, A. Pictet, J. Vermeulen, G. Conte, R. Gonnet, P. Boselli, and M. Boselli. 2016. Revision of the Early Cretaceous genera Heminautilus Spath, 1927, and Josanautilus Martínez & Grauges, 2006 (Nautilida, Cenoceratidae). Carnets de Géologie 16(5):61-212 [M. Clapham/M. Clapham]