Collection NJ353, Dawangou, northwestern Tarim Basin (Ordovician of China)

Where: Xinjiang, China (40.6° N, 79.5° E: paleocoordinates 30.6° S, 118.1° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Didymograptus murchisoni graptolite zone, Saergan Formation, Llanvirn (466.0 - 460.9 Ma)

• one of lowermost collection in bed 14

Environment/lithology: basinal (); lithified, black mudstone and lithified lime mudstone

• deposited under stagnant and restricted circulation environment in outer shelf basin
• Bed from 4.3 m section of black shales intercalated with lenticular 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, G. Yin, and Z. Zhou. 2014. Ordovician (Darriwilian-early Katian) trilobite faunas of northwestern Tarim, Xinjiang, China. Memoirs of the Association of Australasian Palaeontologists 46:1-142 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188333: authorized by Melanie Hopkins, entered by Melanie Hopkins on 29.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Olenida - Olenidae
Porterfieldia sinensis Chang and Fan 1965 trilobite
 Asaphida - Asaphidae
Lisogorites sp. Chugaeva 1958 trilobite