Upper Jenhochiao Formation near Jenhochiao, Western Yunnan Province (Silurian of China)

Where: Yunnan, China (25.0° N, 99.0° E: paleocoordinates 0.8° N, 137.8° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Upper Jenhochiao Formation, Wenlock (433.4 - 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. Formation thought to span much or all of Wenlock. It has been subdivided into graptolite zones, but the shelly fauna are are assigned to these zones.

• formation-level stratigraphic resolution

Environment/lithology: marine; gray, sandy shale

• Correlation chart shows graptolite-based ba 5.
• "The Jenhochiao Series [including both Lower J. Fm. and Upper J. Fm.] is made up of yellowish-brown and black sandy shale, and shale...[some limestone has also been mentioned in Lower J. Fm.]..." "[Upper J.] has thickness of 56.5 m."

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 27783: authorized by Michael Foote, entered by Michael Foote on 09.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

• Graptolite list goes back to the late 1940s for the most part, but shelly faunal list is more up-to-date (1982).
Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Cyrtograptidae
Cyrtograptus rigidus
 Graptoloidea - Monograptidae
Pristiograptus dubius, Monograptus flexilis, Monograptus vomerina, Monograptus flemingii
 Graptoloidea - Retiolitidae
Spinograptus spinosus
Conodonta
 Prioniodontida - Balognathidae
"Spathognathodus pennatus" = Pterospathodus pennatus
"Spathognathodus pennatus" = Pterospathodus pennatus Walliser 1964 conodont
Rhynchonellata
 Rhynchonellida - Hebetoechiidae
? Lanceomyonia sp.
? Lanceomyonia sp. Havlíček 1960
Strophomenata
 Strophomenida - Aegiromenidae
Aegiria sp.
Aegiria sp. Opik 1933
 Orthotetida - Chilidiopsidae
Morinorhynchus sp.
Morinorhynchus sp. Havlicek 1965
Trilobita
 Proetida - Aulacopleuridae
Aulacopleura sp.
Aulacopleura sp. Hawle and Corda 1847 trilobite
 Odontopleurida - Odontopleuridae
Primaspis sp.
Primaspis sp. Richter and Richter 1917 trilobite
corrected from "Ptimaspis"
 Phacopida - Calymenidae
Calymene sp.
Calymene sp. Brongniart 1822 trilobite
 Phacopida - Dalmanitidae
Odontochile sp.
Odontochile sp. Hawle and Corda 1847 trilobite