Sa 203, Sanchu area, upper Ishido Formation, Gunma (Cretaceous of Japan)

Where: Japan (36.1° N, 138.8° E: paleocoordinates 46.6° N, 140.8° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Ishido Formation, Late/Upper Barremian (130.0 - 125.5 Ma)

• upper Ishido Formation

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified, calcareous sandstone

• very fine-grained calcareous sandstone

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 66079: authorized by Wolfgang Kiessling, entered by Uta Merkel on 28.09.2006, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Hydrozoa
 Hydroida - Chondroplidae
Cephalopoda
 Phylloceratida - Phylloceratidae
? Calliphylloceras sp. Spath 1927 ammonite
Phyllopachyceras aff. infundibulum d'Orbigny 1840 ammonite
 Ammonitida - Bochianitidae
? Kabylites sp. Durand Delga 1954 ammonite
 Ammonitida - Desmoceratidae
"Barremites (Barremites) aff. strettostoma" = Barremitites strettostoma Uhlig 1883 ammonite
 Ammonitida - Ancyloceratidae
Acrioceras aff. tabarelli Astier 1851 ammonite
 Ammonitida - Heteroceratidae
Heteroceras sp. d'Orbigny 1849 ammonite
? Heteroceras sp. d'Orbigny 1849 ammonite
 Ammonitida - Acrioceratidae
? Hamiticeras sp. Anderson 1938 ammonite
 Ammonitida - Oppeliidae
Aconeceras sp. Hyatt 1903 ammonite
 Ammonoidea - Hamulinidae
Anahamulina sp. Hyatt 1900 ammonite
Anahamulina aff. subcylindrica d'Orbigny 1850 ammonite
 Nautilida - Nautilidae
"Cymatoceras aff. neocomiensis" = Cymatoceras neocomiense
"Cymatoceras aff. neocomiensis" = Cymatoceras neocomiense d'Orbigny 1840 nautiloid
 Nautilida - Cenoceratidae
Heminautilus japonicus n. sp. Baudouin et al. 2016 nautiloid
Heminautilus cf. H. lallierianus in Obata et al., 1984