Collection NJ548, Dawangou, northwestern Tarim Basin (Ordovician of China)

Where: Xinjiang, China (40.6° N, 79.5° E: paleocoordinates 34.8° S, 112.6° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Climacograptus lanceolatus graptolite zone, Yingan Formation, Katian (453.0 - 445.2 Ma)

• one of lower collections in bed 1 [= bed 24 of Zhou et al 2014]

Environment/lithology: slope; lithified, black mudstone and lithified, black, gray, argillaceous lime mudstone

• deposited below wave base (>70 m) on northwestern slope of Tarim carbonate platform
• Bed from 14.4 m section of black shales intercalated with thin-bedded and lenticular greyish-black argillaceous laminated calcilutites

Size class: macrofossils

Collected in 1987; reposited in the NIGPAS

Collection methods: surface (in situ), mechanical,

• Collection made as part of an extensive field investigation of the periphery of the Tarim Basin by geologists of the Nanjing Institute of Geology and Palaeontology, Academia Sinica, and the 05 Project Administration, Bureau of Petroleum Geology of Southwest China.

Primary reference: Z. Zhou, B. D. Webby, and W. Yuan. 1995. Ordovician trilobites from the Yingan Formation of northwestern Tarim, Xinjiang, northwestern China. Alcheringa 19(1):47-72 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188402: authorized by Melanie Hopkins, entered by Melanie Hopkins on 31.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Asaphida - Raphiophoridae
Taklamakania tarimensis Zhang 1979 trilobite
Ampyxinella rotundata Zhang 1979 trilobite