Chaotian Section, Dalong Formation, Uppermost Limestone, Bed D6 (Permian of China)

Also known as Mingyuexia Gorge

Where: Sichuan, China (32.7° N, 105.9° E: paleocoordinates 10.5° N, 91.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• "Pseudotirolites-Pleuronodoceras Zone and Rotodiscoceras Zone of the late Changhsingian"

•bed within a 2 m interval

• bed-level stratigraphic resolution

Environment/lithology: gray limestone

• entire section is mostly proximate "to a carbonate platform" but chert incalacations are from "a slightly deeper environment than platform"
• "uppermost (2 m thick) part of the formation comprises gray, micritic limestone rhythmically bedded in 5 cm with nodular surface... Thin layers of acidic tuff, less than 10 cm thick, occur at 8 horizons [separating the fossiliferous beds]"

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 73831: 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 - Paragastrioceratidae
Pseudogastrioceras spp.
Pseudogastrioceras spp. Spath 1936 ammonite
 Ceratitida - Pleuronodoceratidae
Pleuronodoceras spp.
Pleuronodoceras spp. Zhao and Liang 1965 ceratite
Conodonta
 Ozarkodinida - Gondolellidae
Clarkina changxingensis