Dabaidi Formation at Dabaidi, Anji County, Zhejiang Province (Silurian of China)

Where: Zhejiang, China (30.6° N, 119.6° E: paleocoordinates 2.3° S, 123.2° E)

• coordinate based on political unit

• local area-level geographic resolution

When: Dabaidi 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.

• formation-level stratigraphic resolution

Environment/lithology: marine; shale and sandstone

• Correlation chart indicates BA 3 position.
• "The total thickness of the unit is 1275 m. The beds consist of gray-green shale, purple sandstone in the upper part, and fine-grained sandstone interbedded with siltstone in the lower and middle parts. The formation is characterized by ripple marks and lense-like shale bands. Some of the shales are laminated."

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 27741: authorized by Michael Foote, entered by Michael Foote on 07.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Pterobranchia
 Graptoloidea - Diplograptidae
Diplograptus sp. graptolite
 Graptoloidea - Climacograptidae
Climacograptus sp. Hall 1865 climacograptid
 Graptoloidea - Retiolitidae
Glyptograptus aff. tamariscus Nicholson 1868 graptolite
Gastropoda
 Murchisoniina - Hormotomidae
Hormotoma sp. Salter 1859 snail
Bivalvia
 Modiomorphida - Modiomorphidae
Rhynchonellata
 Orthida - Dalmanellidae
Resserella sp. Bancroft 1928
Strophomenata
 Strophomenida -
Strophomenida indet. Opik 1934
"strophomenoid"
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
Trilobita
 Phacopida - Encrinuridae
Encrinuroides sp. Reed 1931 trilobite
 Corynexochida - Illaenidae
Illaenus sp. Dalman 1827 trilobite
 Proetida - Proetidae
Proetus sp. Steininger 1831 trilobite