Also known as Type section of Xiushan Formation (Upper Member)
Where: Sichuan, China (28.6° N, 108.9° E: paleocoordinates 6.3° N, 126.7° E)
• coordinate based on political unit
• basin-level geographic resolution
When: Upper Member (Xiushan Formation), Telychian (438.5 - 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. "The age of the Xiushan Formation is still an open question...On the chart we place the lower member in the latest Llandovery and the upper member in the latest Llandovery to early Wenlock." (Formation overlies Rongxi Fm., which is regarded as Telychian.) More recent data puts in in Telychian only, as the overlying Huixingshao is considered Telychian (PJW 2018-04-22).
• member-level stratigraphic resolution
Environment/lithology: marine; shale and mudstone
Size classes: macrofossils, mesofossils
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 27908: authorized by Michael Foote, entered by Michael Foote on 16.01.2003
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Crinoidea | |
Dazhucrinus sp. Mu and Wu 1974 Sea lily | |
Pterobranchia | |
Monoclimacis chuchlensis, Monoclimacis operculum, Monoclimacis flexilis, Monograptus guizhouensis, Monograptus biformatus, Monograptus shiqianensis
Monoclimacis chuchlensis graptolite
Monoclimacis operculum graptolite
Monoclimacis flexilis graptolite
Monograptus guizhouensis graptolite
Monograptus biformatus graptolite
Monograptus shiqianensis graptolite | |
Stomatograptus sinensis graptolite
Stomatograptus shiqianensis graptolite | |
Cephalopoda | |
Protobactrites sp. Hyatt 1900 | |
Paraphragmites sp. Flower 1943
Lyecoceras sp. Mutvei 1957 | |
Kailiceras sp. Chen and Liu 1974 | |
Parahelenites sp. Chen and Liu 1974 | |
Eushantungoceras sp. Shimizu and Obata 1935 | |
Actinodochmioceras sp. Chen 1981
Orthodochmioceras sp. Chen et al. 1981 | |
Sichuanoceras sp. Chang 1962
Neosichuanoceras sp. Chen et al. 1981 | |
Ohioceras sp. Shimizu and Obata 1935 | |
Euvirgoceras sp. Chen 1974 | |
Calorthoceras sp. Chen et al. 1981
Pedanochonoceras sp. Chen et al. 1981 | |
Mixosiphonocerina sp. Chen et al. 1981
Piestoocerina sp. Chen et al. 1981 | |
Gastropoda | |
Hormotoma sp. Salter 1859 snail | |
Bivalvia | |
Modiomorpha crypta clam | |
? Mila sp. Barrande 1881 clam | |
Lingulata | |
Lingula sp. BruguiƩre 1797 | |
Rhynchonellata | |
Brevilamnulella sp. Amsden 1974 | |
Striispirifer sp. Cooper and Muir-Wood 1951
Eospirifer sp. Schuchert 1913 | |
"Cryptatrypa sp." = Glassia
"Cryptatrypa sp." = Glassia Davidson 1881 | |
"Dubaria sp." = Septatrypa Kozlowski 1929
"Atrypopsis rongxiensis" = Septatrypa
Atrypoidea sp. Mitchell and Dun 1920 | |
"Salopinella minuta" = Salopina
"Salopinella minuta" = Salopina | |
Strophomenata | |
Cymostrophia sp. Caster 1939 | |
Mesopholidostrophia sp. Williams 1950 | |
"Aegiria grayi" = Jonesea grayi
"Aegiria grayi" = Jonesea grayi Davidson 1849 | |
Valdaria sp. Bassett and Cocks 1974 | |
Trilobita | |
Latiproetus mucronatus trilobite | |
Rongxiella globosa, Senticucullus spinicaudatus, Encrinuroides sp., Kailia quadrisulcata, Kailia intersulcata, Coronocephalus tenuisulcatus, Coronocephalus rongxiensis
Rongxiella globosa trilobite
Encrinuroides sp. Reed 1931 trilobite
Kailia quadrisulcata trilobite
Kailia intersulcata trilobite
Coronocephalus tenuisulcatus Chang 1974 trilobite
Coronocephalus rongxiensis Chang 1974 trilobite |