Where: Guizhou, China (27.5° N, 108.2° E: paleocoordinates 7.8° N, 125.8° E)

• coordinate based on political unit

• basin-level geographic resolution

When: Xiangshuyuan Formation, Llandovery (443.4 - 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. "In light of the presence of Pristiograptus gregarius in the underlying formation, and the presence in the lower part of this formation of Borealis, it was assigned to the late Middle Llandoverian. The upper part of the formation containing Stricklandia, Merciella, Paraconchidium, and Virgianella was assigned to the earliest Late Llandovery." Above Lungmachi Fm. and below Leijiatun Fm.

• formation-level stratigraphic resolution

Environment/lithology: marine; marl and reef rocks

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 27900: authorized by Michael Foote, entered by Michael Foote on 16.01.2003

Creative Commons license: CC BY (attribution)