Where: Japan (37.1° N, 140.9° E: paleocoordinates 24.0° N, 114.7° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Kashiwadaira Member (Takakurayama Formation), Capitanian (265.1 - 259.9 Ma)
• The Takakurayama Formation is exposed in the northeastern slope of Mt. Takakurayama, dipping 30-45 degrees W and striking in a general NNE-SSW direction, and occupying the area of about 3 square kilometers. This formation is subdivided into three members: 1) the Iriishikura Member, consisting mostly of shale with some sandstone beds, 290 m thick, 2) the Motomura Member, consisting mostly of sandstone and conglomerate with some shale beds, 167 m thick, and 3) the Kashiwadaria Member, consisting mostly of shale with some sandstone and conglomerate beds, 348 m thick, in ascending order.
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified, sandy shale
Size class: macrofossils
Preservation: mold/impression
Collected by J. Tazawa, N. Kaneko, S. Hasegawa in 1986-2005
Primary reference: J. Tazawa, M. Fujikawa, Y. Zakharov and S. Hasegawa. 2005. Middle Permian ammonoids from the Takakurayama area, Abukuma Mountains, northeast Japan, and their stratigraphical significance. Science Reports of Nigata University 20:15-27 [T. Olszewski/L. Fall]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 62292: authorized by Tom Olszewski, entered by Leigh Fall on 17.07.2006, edited by Matthew Clapham
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Propinacoceras sp. Gemmellaro 1887 ammonite | |
Roadoceras sp. Zhou 1985 ammonite | |
Agathiceras sp. Gemmellaro 1887 ammonite | |
? Mexicoceras sp. Ruzhencev 1955 ammonite | |
Strophomenata | |
? Derbyia sp.1 Waagen 1884
Derbyia schellwieni1 Frech 1911 | |
Dyoros (Dyoros) sp.1, Chonetinella transversa n. sp.1, Chonetinella iwakiensis n. sp.1, Chonetinella krotovi1
Dyoros (Dyoros) sp.1 Stehli 1954
Chonetinella transversa n. sp.1 Tazawa 2008
Chonetinella iwakiensis n. sp.1 Tazawa 2008
Chonetinella krotovi1 Fredericks 1925 | |
Transennatia gratiosa1 Waagen 1884
Lamnimargus peregrinus1 Fredericks 1924 | |
Anidanthus ussuricus1 Fredericks 1924
Terrakea sp.1 Booker 1929 | |
Costatumulus cf. tazawai1 Shen et al. 2000 | |
Oldhamina cf. lianyangensis1 Zhan 1979 | |
Rhynchonellata | |
Stenoscisma margaritovi1 Tschernyschew 1902 | |
Rhynchopora sp.1 King 1865 | |
Elivina tibetana1 Diener 1897
? Spiriferella sp.1 Tschernyschew 1902
Spiriferella saranae1 de Verneuil 1845
Alispiriferella lita1 Fredericks 1924 | |
Gypospirifer kobiyamai2 Tazawa and Araki 2013 | |
Cathayspirina sp.1 Liang 1990 | |
Hustedia grandicosta1 Davidson 1862 |