Collection NJ294, Dawangou, northwestern Tarim Basin (Ordovician of China)

Where: Xinjiang, China (40.6° N, 79.5° E: paleocoordinates 27.6° S, 121.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Amorphognathus variabilis conodont zone, Dawangou Formation, Arenig (478.6 - 466.0 Ma)

Environment/lithology: slope; lithified, glauconitic, shelly/skeletal, gray grainstone and chert

• Based on composition and taphonomy of faunal assemblage
• Bed from 6 meter thick section of grey, medium-bedded, glauconite-bearing biocalcarenites, with cherty masses and bands

Size class: macrofossils

Collected in 1987; reposited in the NIGPAS, UNSM

• 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, W. T. Dean, W. Yuan and T. Zhou. 1998. Ordovician trilobites from the Dawangou Formation, Kalpin, Xinjiang, north-west China. Palaeontology 41(4):693-735 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 170838: authorized by Melanie Hopkins, entered by Melanie Hopkins on 27.06.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Corynexochida - Leiostegiidae
Pseudocalymene quadrata
Pseudocalymene quadrata Lu 1975 trilobite
Abundance reported as 6-15 specimens
 Corynexochida - Illaenidae
Illaenus sinensis
Illaenus sinensis Yabe 1920 trilobite
Abundance reported as 6-15 specimens
 Proetida - Telephinidae
Carolinites ichangensis
Carolinites ichangensis Lu 1975 trilobite
 Phacopida - Pliomeridae
Ovalocephalus primitivus
Ovalocephalus primitivus trilobite
Subspecies extraneus; abundance reported as 2-5 specimens
 Phacopida - Cheiruridae
Eccoptochile sp.
Eccoptochile sp. Hawle and Corda 1847 trilobite
 Asaphida - Nileidae
Nileus walcotti
Nileus walcotti Endo 1932 trilobite
Abundance reported as 16-35 specimens
 Asaphida - Asaphidae
Zhenganites xinjiangensis, Ogmasaphus hannanicus, Birmanites brevicus, Liomegalaspides major, Mioptychopyge trinodosa
Zhenganites xinjiangensis Zhang 1981 trilobite
Abundance reported as 6-15 specimens
Ogmasaphus hannanicus Lu 1975 trilobite
Abundance reported as 6-15 specimens
Birmanites brevicus Xiang and Zhou 1987 trilobite
Abundance reported as 6-15 specimens
Liomegalaspides major Zhang 1981 trilobite
Abundance reported as 6-15 specimens
Mioptychopyge trinodosa Zhang 1981 trilobite
Abundance reported as 6-15 specimens [Mioptychopyge trinodus]