"Shihniulan Formation" at Longdaba, Weixin, NE Yunnan Province (Silurian to of China)

Where: Yunnan, China (27.8° N, 105.1° E: paleocoordinates 9.5° N, 127.7° E)

• coordinate based on political unit

• local area-level geographic resolution

When: "Shihniulan" Formation, Aeronian to Aeronian (440.8 - 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. "This unit was measured by the 103 Oil Exploration Team of Yunnan and Guizhou and the 8th Team of the Geological Bureau of Yunnan...We assign [it] to the "Sh. Fm." The lithology...differs considerably fromt he typical Sh...which lacks sandstone...It is of late Middle to early Late Llandovery age because of its fauna and stratigraphic position above the well-dated Lungmachi Formation."

• formation-level stratigraphic resolution

Environment/lithology: marine; marl and argillaceous limestone

• "The lithology consists of marl, argillaceous limestone interbedded with sandstone...The unit is about 200 m thick."

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 27837: authorized by Michael Foote, entered by Michael Foote on 14.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Anthozoa
 Heliolitida - Plasmoporidae
Plasmopora sp. Milne-Edwards and Haime 1849 tabulate coral
 Heliolitida - Halysitidae
Halysites catenularia Linnaeus 1767 tabulate coral
 Stauriida - Streptelasmatidae
Dinophyllum sp. Lindström 1882 horn coral
 Cystiphyllida - Tryplasmatidae
Tryplasma sp. Lonsdale 1845 horn coral
 Cystiphyllida - Cystiphyllidae
? Cystiphyllum sp. Lonsdale 1839 horn coral
Rhynchonellata
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
 Atrypida -
Zygospiraella sp. Nikiforova 1961
 Pentamerida - Virgianidae
? Pleurodium sp. Wang 1955
Gastropoda
 Murchisoniina - Hormotomidae
Hormotoma sp. Salter 1859 snail
 Euomphalina - Lesueurillidae
Pararaphistoma sp. Vostokova 1955 snail
 Euomphalina - Ophiletidae
Ecculiomphalus sp. Portlock 1843 snail