Yuanbaoshan Formation at Ejin Qi, Neimonggol (Silurian of China)

Where: Nei Mongol, China (40.5° N, 100.1° E: paleocoordinates 30.3° S, 108.3° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Yuanbaoshan 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. "...graptolites...indicating an Upper Llandovey age"

• formation-level stratigraphic resolution

Environment/lithology: marine; siliciclastic sediments

• Correlation chart shows ba5 based on graptolites.
• "The unit consists of volcanic and clastic rocks with a thickness of 1600 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 27911: authorized by Michael Foote, entered by Michael Foote on 16.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Retiolitidae
Petalolithus elongatus, Retiolites geinitzianus
Retiolites geinitzianus Barrande 1850 graptolite
 Graptoloidea - Monograptidae
Monoclimacis griestoniensis, Monoclimacis linnarssoni, Streptograptus crispus, Streptograptus runcinatus, Monograptus priodon, Spirograptus turriculatus
Monograptus priodon Bronn 1835 graptolite
 Graptoloidea - Climacograptidae
Climacograptus rectangulatus