Where: Xizang, China (32.5° N, 91.0° E)

• Paleocoordinates: 12.2° S, 75.8° E (Wright 2013)

• coordinate estimated from map

• local area-level geographic resolution

When: Dongka 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. Original authors correlated with Lojoping Fm. on basis of fossils. "The overlying strata are unfossiliferous phyllite, quartzite, and crystalline limestone interbedded with marble, that lie conformably on the Dongka Formation...Liang and Xia date these metamorphics as Middle and Upper silurian. The base of the Dongka fm. is unknown. Although the fossils do indicate a Silurian age, we feel that the position of the Dongka Formation within the Silurian is still uncertain." Nevertheless, the correlation chart assigns it to the Lower Silurian.

• formation-level stratigraphic resolution

Environment/lithology: marine; gray limestone and dolomitic limestone

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 27745: authorized by Michael Foote, entered by Michael Foote on 07.01.2003

Creative Commons license: CC0 (CC0)