Hanjiadian (Silurian of China)

Also known as Songkan Formation at Hanjiadian, Tongzi County, N Guizhou Province

Where: Guizhou, China (28.6° N, 106.9° E: paleocoordinates 8.6° N, 126.9° E)

• coordinate based on political unit

• local area-level geographic resolution

When: Monograptus sedgwicki graptolite zone, Songkan Formation, Aeronian (440.8 - 438.5 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. "The fauna may be roughlycorrelated with a part of the M. sedgwickii zone."

• formation-level stratigraphic resolution

Environment/lithology: marine; gray, calcareous shale and marl

• Correlation chart indicates BA3 based on shelly fauna.
• "consists of yellowish, nodular marl in the upper part, and dark-gray, calcareous shale in the lower...The formation is 131 m thick."

Size class: macrofossils

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 27847: authorized by Michael Foote, entered by Michael Foote on 14.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Auloporida - Multithecoporidae
Syringoporella sp. Kettner 1934 tabulate coral
 Stauriida - Amplexidae
 Spiriferida - Cyrtiidae
 Atrypida -
Zygospiraella venusta Rong and Yang 1981
 Atrypida - Atrypinidae
 Orthocerida - Songkanocerasidae
Songkanoceras sp. Chen et al. 1981
 Proetida - Aulacopleuridae