ammonites
Gangdeershan, NZ 20, 23 (Cambrian of China)

Where: Nei Mongol, China (39.6° N, 107.0° E: paleocoordinates 5.4° S, 138.7° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Metagraulos trilobite zone, Hsuchuang Formation, Taijangian (513.0 - 505.0 Ma)

• samples NZ 20, 23, Hsuchuangian (N China) = Taijiangian, stage 5 of Cambrian series 3

• bed-level stratigraphic resolution

Environment/lithology: lithified limestone

• western marginal part of the North China Platform
• Hsuchuang Formation: gray limestone, oolitic limestone, green or purple shale

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: W. T. Zhang and J. L. Yuan. 1981. Trilobites from the Hsuchuang Formation (lower Middle Cambrian) in western marginal parts of the North China Platform. Geological Society of America Special Paper 187:161-175 [W. Kiessling/U. Merkel] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 125424: authorized by Wolfgang Kiessling, entered by Uta Merkel on 09.03.2012