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