Where: Nei Mongol, China (42.0° N, 110.0° E: paleocoordinates 23.5° S, 108.8° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Xibiehe Formation, Ludlow to Ludlow (427.4 - 419.2 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 description placed formation in Mid Devonian, but "Li Wen-guo et al. (1979) consider this fauna to be of Late Ludlow to Pridoli age, chiefly on the basis of the brachiopods and stromatoporoids."

• formation-level stratigraphic resolution

Environment/lithology: marine; gray, green sandstone and shelly/skeletal 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 27903: authorized by Michael Foote, entered by Michael Foote on 16.01.2003

Creative Commons license: CC BY (attribution)