Chenxiacun Formation, Lower Member, Cangshan, SW of Hanshan, Anhui Province: Telychian, China

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Nalilvkinia sp.
Callocyrtocerina guizhouensis
Stromatoporoidea - Clathrodictyida - Clathrodictyidae
Clathrodictyon vesiculosum Nicholson and Murie 1878
Anthozoa - Heliolitida - Heliolitidae
Helioplasmolites minor
Anthozoa - Heliolitida - Halysitidae
Acanthohalysites hanshanensis
Anthozoa - Favositida - Favositidae
Mesofavosites sp. Sokolov 1951
Favosites gothlandicus Lamarck 1816
Anthozoa - Stauriida - Stauriidae
Ceriaster minor
Anthozoa - Cystiphyllida - Tryplasmatidae
Tryplasma anhuiensis
Crinoidea - Cyathocrinida - Petalocrinidae
Petalocrinus chenxiacunensis
Gastropoda - Euomphalina - Platyceratidae
Cyclonema sp. Hall 1852
Cephalopoda - Oncocerida - Nothoceratidae
Yichangoceras sp. Chen et al. 1981
Cephalopoda - Orthocerida - Dawsonoceratidae
Calocyrtocerina guizhouensis
Rhynchonellata - Atrypida - Atrypinidae
Nalivkinia sp.
Rhynchonellata - Atrypida
Zygospiraella sp. Nikiforova 1961
Trilobita - Corynexochida - Styginidae
Scutellum (Thysanopeltella) sp. Pusch 1833
see common names

Geography
Country:China State/province:Anhui
Coordinates: 34.0° North, 118.0° East (view map)
Paleocoordinates:23.1° South, 123.1° East
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Silurian Epoch:Llandovery
Stage:Telychian 10 m.y. bin:Silurian 1
*Epoch:Late/Upper Llandovery
Key time interval:Telychian
Age range of interval:438.50000 - 433.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Chenxiacun
Stratigraphic resolution:member
Stratigraphy comments: Except where otherwise stated, ref. 7624 uses Lower Silurian as equivalent to Llandovery, Middle Silurian as equivalent to Wenlock, and Upper Silurian as equivalent to Ludlow plus Pridoli. "Qian [1978] subdivided the formation into two parts. Fossils from the lower part include...Cyclonema sp., which suggests a Late Llandoveyr age, and may be correlated with the Lojoping Fm. the fossils from the upper part include...Pristiograptus cangshanensis. The graptolite is similar to Monoclimacis fenggangensis from the Leijiatun Formation of NE Guizhou, which suggests a later Upper Llandovery age. This formation was previously included with the underlying Kaochiapien Fm." Correlation chart suggest correlation with turriculatus zone for lower member and late turriculatus zone through rest of Llandovery for upper member.
Lithology and environment
Primary lithology:green,yellow calcareous siltstone
Secondary lithology: "limestone"
Lithology description: "The unit consists mainly of yellowish-green, calcareous siltstone with interbedded thin limestone. Some fine-grained sandstone and shale occur in the lower part. The unit is 107 m thick. Fossils are abundant, and chiefly shelly. Qian subdivided the formation intwo the parts. The lower part consists of siltstone, with some limestone, whereas the upper part is chiefly shale with some interbedded siltstone."
Environment:marine indet.
Geology comments: Correlation chart indicates BA 3 position for this unit.
Taphonomy
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:27737
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2003-01-07 11:20:05 Last modified:2006-09-13 14:01:03
Access level:the public Released:2003-01-07 11:20:05
Creative Commons license:CC BY
Reference information

Primary reference:
7624. E.-z. Mu, A. J. Boucot, X. Chen and J.-y. Rong. 1986. Correlation of the Silurian rocks of China. In A. J. Boucot and W. B. N. Berry (eds.), Geological Society of America Special Paper 202:1-80 [M. Foote/M. Foote/P. Wagner]