Takuan Formation (Sifengya Member) at Huanggexi, Daguan Co., NE Yunnan Prov. (Silurian of China)

Where: Yunnan, China (27.7° N, 103.9° E: paleocoordinates 10.2° N, 128.6° E)

• coordinate based on political unit

• local area-level geographic resolution

When: Sifengya Member (Takuan Formation), Telychian (438.5 - 433.4 Ma)

• 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. Revised usage of Takuan Formation to restrict it so Songkan, Huanggexi, and Sifengya units (from bottom to top). Daluzhai is regarded as synonym of Xiushan Formation. "The fauna [of the Sifengya Member] is of Upper Llandovery age."

• member-level stratigraphic resolution

Environment/lithology: marine; calcareous shale and argillaceous limestone

• Correlation chart indicates BA3 assignment based on shelly fauna for the Takuan formation, and graptolite-based ba3 for "Songkan Member."
• "The Sifengya Member consists of purple-red, calcareous shale, argillaceous siltstone, and gray-green, calcareous shale, silty limestone, bioclastic limestone, and argillaceous limestone rich in fossils, with a total thickness of 165 m."

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 27851: authorized by Michael Foote, entered by Michael Foote on 14.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Anthozoa
 Stauriida - Stauriidae
Ceriaster minor horn coral
Ceriaster sp. Lindström 1883 horn coral
 Stauriida - Pycnostylidae
 Stauriida - Kyphophyllidae
 Stauriida - Ketophyllidae
Tabularia sp. Soshkina 1937 horn coral
 Stauriida - Entelophyllidae
Entelophyllum sp. Wedekind 1927 horn coral
 Stauriida - Streptelasmatidae
Brachyelasma sp. Lang et al. 1940 horn coral
 Stauriida - Lykophyllidae
Pseudophaulactis sp. Zaprudskaya 1963 horn coral
 Cystiphyllida - Cystiphyllidae
Microplasma sp. Dybowski 1873 horn coral
 Cystiphyllida - Tryplasmatidae
Aphyllum sp. Soshkina 1937 horn coral
 Rugosa - Chonophyllidae
 Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813 tabulate coral
 Favositida - Multisoleniidae
Multisolenia sp. Fritz 1937 tabulate coral
 Favositida - Favositidae
"Palaeofavosites sp." = Paleofavosites Twenhofel 1914 tabulate coral
Mesofavosites sp. Sokolov 1951 tabulate coral
Favosites sp. Lamarck 1816 tabulate coral
 Favositida - Parastriatoporidae
Parastriatopora sp. Sokolov 1949 tabulate coral
 Favositida - Alveolitidae
Alveolites sp. Lamarck 1801 tabulate coral
Gastropoda
 Murchisoniina - Hormotomidae
Catazone changningensis Xi and Yu 1990 snail
 Euomphalina - Holopeidae
Bivalvia
 Ostreida - Pterineidae
Actinopteria sp. Hall 1884 oyster
Strophomenata
 Strophomenida - Leptostrophiidae
"Leptostrophia" sp. Hall and Clarke 1892
Rhynchonellata
 Atrypida - Atrypinidae
 Spiriferida - Cyrtiidae
Striispirifer sp. Cooper and Muir-Wood 1951
 Athyridida - Nucleospiridae
Stenolaemata
 Cryptostomata - Fenestellidae
Trilobita
 Phacopida - Encrinuridae
Encrinuroides sp. Reed 1931 trilobite
 Life - Codonophyllidae
Codonophyllum sp. Wedekind 1927