Collection NJ412, 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 bicornis graptolite zone, Qilang Formation, Katian (453.0 - 445.2 Ma)

• one of lower collections in bed 18

Environment/lithology: slope; lithified, nodular, shelly/skeletal, gray, green, argillaceous lime mudstone and lithified, green, yellow, calcareous mudstone

• deposited in deep outer shelf slope, probably less than 200 m depth
• Bed from 29.6 m section of rhythmically interbedded greyish-green thin-bedded biocalcilutites and nodular argillageous calcilutites and graptolite-bearing yellowish- green calcareous silty shales.

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 188365: authorized by Melanie Hopkins, entered by Melanie Hopkins on 29.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Asaphida - Cyclopygidae
Cyclopyge recurva Lu 1962 trilobite