Miaokao Formation at Liaojiaoshan near Qujing, E Yunnan Province (Silurian of China)

Where: Yunnan, China (25.5° N, 103.8° E: paleocoordinates 9.1° N, 129.9° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Miaokao Formation, Ludlow (427.4 - 423.0 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. "Spathognathodus crispus occurs in the lower part of the Miaokao Fm. Therefore, we correlate the M. Fm. with the Late Ludlow." It's not clear from the correlation chart whether this is Ludfordian in the strict sense.

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone and flat-pebble shale

• Correlation chart indicates BA3 based shelly fauna.
• "composed of thin-bedded, nodular limestone alternating with shale, and contains a rich fauna...Bivalves are noticeably abundant in the upper part of the M., and brachiopods in the lower part."

Primary reference: E.-z. Mu, A. J. Boucot, X. Chu 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/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 27796: authorized by Michael Foote, entered by Michael Foote on 09.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Proetida - Proetidae
Warburgella sp. Reed 1931 trilobite
Proetus sp. Steininger 1831 trilobite
Ostracoda
  -
Ostracoda indet. Latreille 1802 ostracod
Strophomenata
 Orthotetida - Areostrophiidae
"Aesopomum delicata" = Aesopomum delicatum
"Aesopomum delicata" = Aesopomum delicatum Rong et al. 1974
Rhynchonellata
 Athyridida - Retziellidae
"Protathyrisina minor" = Retziella, "Protathyrisina plicata" = Retziella, "Protathyrisina uniplicata" = Retziella, "Protathyrisina quadriplicata" = Retziella
"Protathyrisina minor" = Retziella
"Protathyrisina plicata" = Retziella
"Protathyrisina uniplicata" = Retziella
"Protathyrisina quadriplicata" = Retziella
 Athyridida - Athyrididae
 Spiriferida - Delthyrididae
 Spiriferida - Reticulariidae
 Atrypida - Lissatrypidae
 Orthida - Schizophoriidae
Bivalvia
 Cyrtodontida - Praecardiidae
 Ostreida - Pterineidae
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
Stenolaemata
 Trepostomida -
 Cryptostomata - Arthrostylidae
Helopora sp. Hall 1851
Conodonta
  -
Trichonodella sp. Branson and Branson 1947 conodont
 Ozarkodinida -
"Hindeodella sp." = Ozarkodina
"Hindeodella sp." = Ozarkodina Branson and Mehl 1933 conodont
Anthozoa
 Favositida - Favositidae
Squameofavosites sp. Chernyshev 1941 tabulate coral
 Stauriida - Kyphophyllidae
Kyphophyllum sp. Wedekind 1927 horn coral