NJ660, Yijianfang section, Bachu area (Ordovician of China)

Where: Xinjiang, China (40.2° N, 78.9° E: paleocoordinates 31.1° S, 117.8° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Undulograptus austrodentatus graptolite zone, Middle Member (Yijianfang Formation), Darriwilian (467.3 - 458.4 Ma)

• middle of bed 32. Reef beds are in the middle member.

• member-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified, gray reef rocks and lithified chert

• middle unit of platform-margin carbonate buildup
• Collection from 8.5 m unit of light grey Calathium-Receptaculites-bioconstructed limestones with chert bands

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 188380: authorized by Melanie Hopkins, entered by Melanie Hopkins on 30.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corynexochida - Styginidae
Promago sp. Holloway 2007 trilobite
 Corynexochida - Panderiidae
Panderia sp. Volborth 1863 trilobite
 Corynexochida - Illaenidae
Parillaenus vetus n. sp. Zhou et al. 2014 trilobite
Nanillaenus crassus n. sp. Zhou et al. 2014 trilobite
Illaenus cekovioides n. sp. Zhou et al. 2014 trilobite
Illaenus tianrongi n. sp. Zhou et al. 2014 trilobite
 Phacopida - Cheiruridae
Kawina sp. Barton 1916 trilobite
Kawina sinica n. sp. Zhou et al. 2014 trilobite
Hemisphaerocoryphe elliptica Lu 1975 trilobite
 Phacopida - Calymenidae
Sthenarocalymene sp. Siveter 1977 trilobite
 Harpida - Harpetidae
Eoharpes yijianfangensis n. sp. Zhou et al. 2014 trilobite
 Proetida - Dimeropygidae
Ischyrotoma sp. Raymond 1925 trilobite
 Asaphida - Asaphidae
"Asaphidae" indet. Burmeister 1843 trilobite
 Asaphida - Remopleurididae
Remopleurides sp. Portlock 1843 trilobite
 Lichida - Lichidae
Tairongia bachuensis n. sp. Zhou et al. 2014 trilobite
Lyralichas qiaoi n. sp. Zhou et al. 2014 trilobite