Collection NJ310, 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: Pterograptus elegans graptolite zone, Saergan Formation, Llanvirn (466.0 - 460.9 Ma)

• one of middle collections in bed 11

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

• deposited under stagnant and restricted circulation environment in outer shelf basin
• Bed from 2.42 m section of alternating beds of black and greyish-green silty shales intercalated with thin-bedded 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: biostratigraphic analysis

PaleoDB collection 188322: authorized by Melanie Hopkins, entered by Melanie Hopkins on 29.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Agnostida - Metagnostidae
Trinodus sp. M'Coy 1846 trilobite