near Na Mo Village, Trang Xa Commune (Ordovician of Vietnam)

Where: Thai Nguyen, Vietnam (21.7° N, 106.1° E: paleocoordinates 17.5° N, 126.5° E)

• coordinate stated in text

• local area-level geographic resolution

When: Na Mo Formation, Caradoc (460.9 - 449.5 Ma)

• Late Caradoc according to Turvey 2005.

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone and gray, green, red, yellow siltstone

• Turvey (2002) refers to it as a shelf environment.
• inter-beds of light-colored limestone. However, Turvey (2002) states that trilobites are from siltstones. Greenish-grey, yellowish and reddish weathering siltstone according to Tong et al. 2001.

Size class: macrofossils

Primary reference: S. T. Turvey. 2005. Early Ordovician (Arenig) trilobite palaeoecology and palaeobiogeography of the South China Plate. Palaeontology 48(3):519-547 [A. Miller/S. Kolbe]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 192784: authorized by Pete Wagner, entered by Pete Wagner on 19.04.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Trinucleida - Raphiophoridae
Lonchodomas aff. yohi2 Sun 1931 trilobite
 Phacopida - Calymenidae
"Calymene douvillei" = Vietnamia douvillei1, "Synhomalonotus birmanicus" = Neseuretinus birmanicus2
"Calymene douvillei" = Vietnamia douvillei1 Mansuy 1908 trilobite
"Synhomalonotus birmanicus" = Neseuretinus birmanicus2 Reed 1906 trilobite