Qiaergaye Formation (Middle) at Tangbaleman, SE of Toli Co., NW Xinjiang Prov. (Silurian to of China)

Where: Xinjiang, China (46.0° N, 83.6° E: paleocoordinates 7.7° S, 69.9° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Qiaergaye Formation, Llandovery to Llandovery (443.4 - 427.4 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. "...paleontologic evidence indicates an Upper Llandovery age for the graptolites, and possibly and Upper Llandovery or Wenlock age for the shelly fossils." Stratigraphic relations discussed by authors imply that the graptolites in type section are from below the middle part of the formation (i.e. below the part yielding shelly fossils).

• member-level stratigraphic resolution

Environment/lithology: marine; tuffaceous, gray, green siltstone and sandstone

• Correlation chart indicates ba2 based on graptolitic fauna.
• For formation as a whole: "The lithology consists of purple-red and gray, gray-green, tuffaceous siltstone, fine-grained sandstone, coarse-grained sandstone interbedded with sandy conglomerate. The thickness of the unit is 1320 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 27816: authorized by Michael Foote, entered by Michael Foote on 13.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Anthozoa
 Heliolitida - Stelliporellidae
Stelliporella sp. Wentzel 1895 tabulate coral
 Heliolitida - Heliolitidae
Heliolites sp. Dana 1846 tabulate coral
 Favositida - Coenitidae
Placocoenites sp. Sokolov 1955 tabulate coral
 Favositida - Theciidae
"Angopora sp." = Thecia (Angopora)
"Angopora sp." = Thecia (Angopora) Jones 1936 tabulate coral
 Favositida - Favositidae
"Palaeofavosites sp." = Paleofavosites Twenhofel 1914 tabulate coral
Favosites sp. Lamarck 1816 tabulate coral
Favosites cf. gothlandicus Lamarck 1816 tabulate coral
Mesofavosites sp. Sokolov 1951 tabulate coral
 Stauriida - Spongophyllidae
Spongophyllum sp. Milne-Edwards and Haime 1851 horn coral
 Stauriida - Disphyllidae
Disphyllum sp. Fromentel 1861 horn coral
 Stauriida - Ptychophyllidae
Ptychophyllum sp. Milne-Edwards and Haime 1850 horn coral
 Cystiphyllida - Tryplasmatidae
Tryplasma sp. Lonsdale 1845 horn coral
Trilobita
 Phacopida - Phacopidae
Phacops sp. Emmrich 1839 trilobite
 Phacopida - Encrinuridae
Encrinurus sp. Emmrich 1844 trilobite
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
 Strophomenida - Chonetidae
Chonetes sp. Fischer de Waldheim 1830
Rhynchonellata
 Rhynchonellida - Camarotoechiidae
"Camarotoechia" sp. Hall and Clarke 1893
 Pentamerida - Pentameridae
Pentamerus sp. Sowerby 1813
 Atrypida - Atrypidae
Atrypa sp. Dalman 1828