PBDB Collection

Gongen-dani Valley, Ryozensan Mountain: Sakmarian, Japan

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Ostracoda - Myodocopida - Polycopidae

	Discoidella informal sp. 1	3 specimens

	Discoidella informal sp. 2	147 specimens
Ostracoda - Podocopida - Acratiidae

	Acratia informal sp. 1	29 specimens
Ostracoda - Podocopida - Beecherellidae

	Acanthoscapha informal sp. 1	15 specimens

	Acanthoscapha informal sp. 2	7 specimens
Ostracoda - Podocopida - Bairdiidae

	Pustulobairdia ohmiensis n. sp. Tanaka 2018	145 specimens

	Bairdiacypris ikeyanoriyukii n. sp. Tanaka 2018	18 specimens

	Paramacrocypris sp. Kozur 1985	31 specimens

	Bairdia informal sp. 1	20 specimens

	Bairdia informal sp. 2	21 specimens

	Bairdia informal sp. 3	11 specimens

	Bairdia tagaensis n. sp. Tanaka 2018	102 specimens

	Rectobairdia informal sp. 1	13 specimens

	Petasobairdia sp. Chen 1982	17 specimens
Ostracoda - Podocopida - Bairdiocyprididae

	Silenites sp.	46 specimens
Ostracoda - Podocopida - Bythocytheridae

	Striatobythoceratina informal sp. 1	2 specimens

	Striatobythoceratina informal sp. 2	2 specimens

	? Monoceratina sp. Roth 1928	3 specimens
Ostracoda - Podocopida - Sigilliidae

	Spinomicrocheilinella sp. Kozur 1985	15 specimens
Ostracoda - Podocopida - Microcheilinellidae

	Microcheilinella shigensis n. sp. Tanaka 2018	28 specimens
Ostracoda - Palaeocopida - Kellettinidae

	Kellettina noriyukii n. sp. Tanaka 2018	66 specimens
Ostracoda - Palaeocopida - Kirkbyidae

	Aurikirkbya informal sp. 1	22 specimens

	Aurikirkbya informal sp. 2	5 specimens

	Aurikirkbya ventrocallosa Becker and Wang 1992	35 specimens
Ostracoda - Palaeocopida - Amphissitidae

	Permokegelites cf. beichuanensis Becker and Wang 1992	35 specimens
Ostracoda - Palaeocopida - Knightinidae

	Knightina sp. Kellett 1933	22 specimens
Ostracoda - Palaeocopida - Kloedenellidae

	Oliganisus ryozensanensis n. sp. Tanaka 2018	28 specimens
Schubertellidae

	Schubertella kingi Dunbar and Skinner 1937

	Biwaella omiensis Morikawa and Isomi 1960
Schwagerinidae

	Pseudofusulina vulgaris

	Pseudofusulina globosa

	Pseudofusulina fusiformis (Schellwien 1909)

	Pseudofusulina regularis (Schellwien 1898)

	Paraschwagerina (Acervoschwagerina) sp. Hanzawa 1949
see common names

Geography

Country:	Japan
Coordinates:	35.3° North, 136.4° East (view map)
Paleocoordinates:	13.0° North, 138.6° East (Wright 2013)
Basis of coordinate:	stated in text
Geographic resolution:	outcrop

Time

Period:	Permian	Epoch:	Cisuralian
Stage:	Sakmarian	10 m.y. bin:	Permian 1
Key time interval:	Sakmarian
Age range of interval:	293.52 - 290.1 m.y. ago

Stratigraphy

Formation:	Ryozensan Limestone
Stratigraphic resolution:	bed
Stratigraphy comments: 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

Lithology and environment

Primary lithology:	gray lithified lime mudstone
Lithology description: Grey-coloured limestone, micritic limestone
Environment:	carbonate indet.

Taphonomy

Modes of preservation:	body,replaced with silica
Size of fossils:	microfossils

Collection methods and comments

Collection methods:	chemical
Reason for describing collection:	taxonomic analysis
Collection method comments: Repository: Micropalaeontology Collection, National Museum of Nature and Science, Tokyo, Japan (MPC-number).

Metadata

Database number:	197662
Authorizer:	M. Clapham, P. Wagner	Enterer:	M. Clapham, P. Wagner
Modifier:	P. Wagner	Research group:	marine invertebrate
Created:	2018-11-21 19:53:02	Last modified:	2025-02-22 15:12:02
Access level:	the public	Released:	2018-11-21 19:53:02
Creative Commons license:	CC0

Reference information

Primary reference:

67398.

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]