G2-zawa Valley, T7, Takakura-yama Mountain, Iwaki City (Permian of Japan)

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

• probably derived from shallow marine continental shelf to a deep-sea basin by sediment-gravity flows
• 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
 Prolecanitida - Medlicottiidae
Propinacoceras sp. Gemmellaro 1887 ammonite
 Goniatitida - Paragastrioceratidae
Roadoceras sp. Zhou 1985 ammonite
 Goniatitida - Agathiceratidae
Agathiceras sp. Gemmellaro 1887 ammonite
 Goniatitida - Cyclolobidae
? Mexicoceras sp. Ruzhencev 1955 ammonite
Strophomenata
 Orthotetida - Derbyiidae
? Derbyia sp.1 Waagen 1884
Derbyia schellwieni1 Frech 1911
 Strophomenida - Rugosochonetidae
Dyoros (Dyoros) sp.1 Stehli 1954
Chonetinella transversa n. sp.1 Tazawa 2008
Chonetinella iwakiensis n. sp.1 Tazawa 2008
Chonetinella krotovi1 Fredericks 1925
 Productida - Paucispiniferidae
Transennatia gratiosa1 Waagen 1884
Lamnimargus peregrinus1 Fredericks 1924
 Productida - Linoproductidae
Anidanthus ussuricus1 Fredericks 1924
Terrakea sp.1 Booker 1929
 Productida - Monticuliferidae
Costatumulus cf. tazawai1 Shen et al. 2000
 Productida - Lyttoniidae
Rhynchonellata
 Rhynchonellida - Stenoscismatidae
Stenoscisma margaritovi1 Tschernyschew 1902
 Rhynchonellida - Rhynchoporidae
Rhynchopora sp.1 King 1865
 Spiriferida - Martiniidae
Martinia sp.1 M'Coy 1844
Martinia semiplana1 Waagen 1883
Martinia lata1 Grabau 1936
 Spiriferida - Spiriferellidae
Elivina tibetana1 Diener 1897
? Spiriferella sp.1 Tschernyschew 1902
Spiriferella saranae1 de Verneuil 1845
Alispiriferella lita1 Fredericks 1924
 Spiriferida - Trigonotretidae
Gypospirifer kobiyamai2 Tazawa and Araki 2013
 Spiriferida - Brachythyrididae
Cathayspirina sp.1 Liang 1990
 Athyridida - Neoretziidae
Hustedia grandicosta1 Davidson 1862