Gongen-dani Valley, Ryozensan Mountain (Permian of Japan)

Where: Japan (35.3° N, 136.4° E: paleocoordinates 15.3° N, 102.9° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Ryozensan Limestone Formation, Sakmarian (295.5 - 290.1 Ma)

• According to Miyamura et al. (1975), the limestones contain fusulinid foraminifera such as Pseudofusulina vulgaris (Schellwien), P. vulgaris var. globosa (Schellwien), P. regularis (Schellwien), P. fusiformis (Schellwien and Dyhrenfurth), Paraschwagerina (Acervoschwagerina) sp., Schubertella kingi Dunbar and Skinner and Biwaella omiensis Morikawa

• bed-level stratigraphic resolution

Environment/lithology: lithified, gray lime mudstone

• Grey-coloured limestone, micritic limestone

Size class: microfossils

Preservation: replaced with silica

Collection methods: chemical

• Repository: Micropalaeontology Collection, National Museum of Nature and Science, Tokyo, Japan (MPC-number).

Primary reference: G. Tanaka, Y. Miyake, T. Ono, A. H. Yuan, M. Ichida, H. Maeda, and S. Crasquin. 2018. Early Permian (Cisuralian) ostracods from Japan: characteristic ostracod assemblage from a seamount of the Panthalassic Ocean. Zootaxa 4515:1-67 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 197662: authorized by Matthew Clapham, entered by Matthew Clapham on 21.11.2018, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Foraminifera
 Fusulinoidea - Schwagerinidae
Pseudofusulina regularis Schellwien 1898
Pseudofusulina fusiformis Schellwien 1909
"Paraschwagerina (Acervoschwagerina) sp." = Acervoschwagerina Hanzawa 1949
 Fusulinoidea - Schubertellidae
Biwaella omiensis Morikawa and Isomi 1960
Schubertella kingi Dunbar and Skinner 1937
Ostracoda
 Myodocopida - Polycopidae
 Palaeocopida - Amphissitidae
Permokegelites cf. beichuanensis Becker and Wang 1992 ostracod
 Palaeocopida - Kellettinidae
Kellettina noriyukii n. sp. Tanaka 2018 ostracod
 Palaeocopida - Knightinidae
Knightina sp. Kellett 1933 ostracod
 Palaeocopida - Kirkbyidae
Aurikirkbya "sp. 1" Sohn 1950 ostracod
Aurikirkbya "sp. 2" Sohn 1950 ostracod
Aurikirkbya ventrocallosa Becker and Wang 1992 ostracod
 Platycopida - Kloedenellidae
Oliganisus ryozensanensis n. sp. Tanaka 2018 ostracod
 Podocopida - Microcheilinellidae
Microcheilinella shigensis n. sp. Tanaka 2018 ostracod
 Podocopida - Sigilliidae
Spinomicrocheilinella sp. Kozur 1985 ostracod
 Podocopida - Bythocytheridae
? Monoceratina sp. Roth 1928 ostracod
Striatobythoceratina "sp. 1" Kozur 1985 ostracod
Striatobythoceratina "sp. 2" Kozur 1985 ostracod
 Podocopida - Beecherellidae
Acanthoscapha "sp. 1" Ulrich and Bassler 1923 ostracod
Acanthoscapha "sp. 2" Ulrich and Bassler 1923 ostracod
 Podocopida - Bairdiidae
Pustulobairdia ohmiensis n. sp. Tanaka 2018 ostracod
Paramacrocypris sp. Kozur 1985 ostracod
Petasobairdia sp. Chen 1982 ostracod
Bairdia "sp. 1" M'Coy 1844 ostracod
Bairdia "sp. 2" M'Coy 1844 ostracod
Bairdia "sp. 3" M'Coy 1844 ostracod
Bairdia tagaensis n. sp. Tanaka 2018 ostracod
"Rectobairdia "sp. 1"" = Bairdia (Rectobairdia) Sohn 1960 ostracod
Bairdiacypris ikeyanoriyukii n. sp. Tanaka 2018 ostracod
 Podocopida - Bairdiocyprididae
Silenites sp. ostracod
 Podocopida - Acratiidae
Acratia "sp. 1" Delo 1930 ostracod