Chowchiachi Group, Basal Part, at Zhoujiaxi, Hunan Province (Silurian of China)

Where: Hunan, China (28.3° N, 108.1° E: paleocoordinates 7.4° N, 126.5° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Chowchiachi Group, 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.

• formation-level stratigraphic resolution

Environment/lithology: marine; siltstone and shale

• Correlation chart indicates BA 3 position.
• "The beds consist of thick-bedded siltstone with shaly partings. Some dark-green, micaceous slate is present. The unit is about 600 m thick at the type locality."

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 27739: authorized by Michael Foote, entered by Michael Foote on 07.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Pterobranchia
 Graptoloidea - Climacograptidae
 Graptoloidea - Diplograptidae
 Graptoloidea - Retiolitidae
Petalolithus sp. graptolite
Glyptograptus cf. tamariscus Nicholson 1868 graptolite
 Graptoloidea - Dimorphograptidae
Parakidograptus acuminatus Nicholson 1867 graptolite
 Graptoloidea - Monograptidae
 Graptoloidea - Normalograptidae
"Climacograptus angustus" = Normalograptus angustus
"Climacograptus angustus" = Normalograptus angustus Perner 1895 graptolite