Chaotian Section, Dalong Formation, Uppermost Limestone, Bed D14: Changhsingian, China

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Conodonta - Ozarkodinida - Gondolellidae
Clarkina subcarinata
Clarkina carinata
see common names

Geography
Country:China State/province:Sichuan
Coordinates: 32.7° North, 105.9° East (view map)
Paleocoordinates:10.5° North, 91.5° East
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Permian Epoch: Lopingian
Stage: Changhsingian 10 m.y. bin: Permian 4
Key time interval: Changhsingian
Age range of interval: 254.14 - 251.902 m.y. ago
Stratigraphy
Formation:Dalong
Stratigraphic resolution:bed
Stratigraphy comments: "Pseudotirolites-Pleuronodoceras Zone and Rotodiscoceras Zone of the late Changhsingian"
bed within a 2 m interval
Lithology and environment
Primary lithology:planar lamination,gray "limestone"
Lithology description: "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]"
Environment:carbonate indet.
Geology comments: entire section is mostly proximate "to a carbonate platform" but chert incalacations are from "a slightly deeper environment than platform"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Also known as:Mingyuexia Gorge
Database number:73834
Authorizer:J. Alroy Enterer:J. Alroy
Research group:marine invertebrate
Created:2007-07-02 20:55:11 Last modified:2007-07-02 23:55:11
Access level:the public Released:2007-07-02 20:55:11
Creative Commons license:CC BY
Reference information

Primary reference:
24748. 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]