Collection NJ468, 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, Qilang Formation, Katian (453.0 - 445.2 Ma)

• one of lower collections in bed 20

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

• deposited in deep outer shelf slope, may be as deep as 100 m depth
• Bed from 34.2 m section of alternating beds of purplish-grey nodular calcilutites and 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 188372: authorized by Melanie Hopkins, entered by Melanie Hopkins on 29.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Corynexochida - Illaenidae
 Asaphida - Asaphidae
Birmanites qilangensis Zhang 1981 trilobite
 Asaphida - Dionididae
Dionide miaopoensis Lu 1975 trilobite
Calymenesun
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