Collection NJ373, 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 upper collections in bed 14

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

• deposited under relatively open marine conditions 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 188343: 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
Geragnostus (Novoagnostus) contractus Zhou et al. 2014 trilobite
 Agnostida - Agnostidae
 Ptychopariida - Shumardiidae
Shumardia tarimuensis Zhang 1981 trilobite
 Proetida - Telephinidae
Telephina cf. angulata Yi 1957 trilobite
 Asaphida - Asaphidae
Zhenganites aff. xinjiangensis Zhang 1981 trilobite
Lisogorites tarimensis Zhang 1981 trilobite
Birmanites "sp. 2" Sheng 1934 trilobite
Birmanites kanlingensis Zhang 1981 trilobite
 Asaphida - Cyclopygidae
Microparia (Quadratopyge) chedaoensis Zhou and Dean 1986 trilobite
 Asaphida - Nileidae
Paraperaspis dawangouensis Zhou et al. 2014 trilobite
 Asaphida - Dionididae
Dionide miaopoensis Lu 1975 trilobite
 Asaphida - Raphiophoridae
Taklamakania xinjiangensis Zhang 1981 trilobite
Nanshanaspis tarimuensis Zhang 1981 trilobite