Collection NJ376, Dawangou, northwestern Tarim Basin (Ordovician of China)

Where: Xinjiang, China (40.6° N, 79.5° E: paleocoordinates 32.8° S, 115.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Nemograptus gracilis graptolite zone, Saergan Formation, Sandbian (458.4 - 453.0 Ma)

• one of lower collections in bed 15

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

• deposited under relatively open marine conditions in outer shelf basin
• Bed from 1.02 m section of greyish-black knotty calcilutites intercalated with black carbonaceous calcareous 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 188346: authorized by Melanie Hopkins, entered by Melanie Hopkins on 29.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Agnostida - Metagnostidae
Dividuagnostus minus Koroleva 1982 trilobite
 Agnostida - Sphaeragnostidae
Sphaeragnostus cf. similaris Barrande 1872 trilobite
 Asaphida - Cyclopygidae
Microparia (Quadratapyge) chedaoensis Zhou and Dean 1986 trilobite
Sagavia laxa Zhou et al. 2014 trilobite
 Asaphida - Nileidae
Paraperaspis angustus Zhou et al. 2014 trilobite