Chaotian Section, Dalong Formation, Upper Mudstone (Permian of China)

Also known as Mingyuexia Gorge

Where: Sichuan, China (32.6° N, 105.9° E: paleocoordinates 10.4° N, 91.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Dalong Formation, Changhsingian (254.2 - 252.2 Ma)

• "Pseudostephanites-Tapashanites Zone of the early Changhsingian"

•upper part of a 22 m thick mudstone interval

• member-level stratigraphic resolution

Environment/lithology: slope; lithified, black mudstone and marl

• entire section is mostly proximate "to a carbonate platform" but chert incalacations are from "a slightly deeper environment than platform"
• "bituminous, black mudstone... bedded, and it intercalates thin (10-20 cm) layers/lenses of marl"

Size class: macrofossils

Primary reference: Y. Isozaki, J. Yao, T. Matsuda, H. Sakai, Z. Ji, N. Shimizu, N. Kobayashi, H. Kawahata, H. Nishi, M. Takano, and T. Kubo. 2004. Stratigraphy of the Middle-Upper Permian and Lowermost Triassic at Chaotian, Sichuan, China. Proceedings of the Japan Academy, Series B 80(1):10-16 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 73823: authorized by John Alroy, entered by John Alroy on 02.07.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Goniatitida - Cyclolobidae
Changhsingoceras sichuanense
Changhsingoceras sichuanense Zhao et al. 1978 ammonite
 Ceratitida - Tapashanitidae
? Pseudostephanites sp., Tapashanites chaotianensis, Tapashanites floriformis, Tapashanites costatus, Sinoceltites curvatus
? Pseudostephanites sp. Zhao and Liang 1965 ceratite
Tapashanites chaotianensis Zhao et al. 1978 ceratite
Tapashanites floriformis Zhao and Liang 1965 ceratite
Tapashanites costatus Zhao et al. 1978 ceratite
Sinoceltites curvatus Zhao and Liang 1974 ceratite
Strophomenata
 Strophomenida - Rugosochonetidae
"Waagenites cf. soochowensis" = Fusichonetes soochowensis
"Waagenites cf. soochowensis" = Fusichonetes soochowensis Chao 1928
 Productida - Paucispiniferidae
"Dictyoclostus gratiosus" = Transennatia gratiosa
"Dictyoclostus gratiosus" = Transennatia gratiosa Waagen 1884
 Productida - Lyttoniidae
Leptodus sp.
Leptodus sp. Kayser 1883
Conodonta
 Ozarkodinida - Gondolellidae
Clarkina subcarinata, Clarkina changxingensis, Clarkina deflecta, Clarkina postwangi