Na Duong Mine layer 80 (Eocene to of Vietnam)

Where: Lang Son, Vietnam (21.7° N, 106.0° E: paleocoordinates 21.4° N, 104.9° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Na Duong Formation, Bartonian to Bartonian (41.3 - 33.9 Ma)

• Attributed to the middle–late Eocene age by Bohme et al. (2013), but Ducrocq et al. (2015) argue for an early late Eocene or middle late Eocene age

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - large; lignite

• In the lower part, the seam occasionally contains coalified tree trunks (Fig. 3C). Characterized as acidic lake.
• The lignite can be characterized as subbituminous coal to coaly shale

•(Wysocka 2009). The coaly shales of the main coal seam (layer 80 in Fig. 2) are laminated and particularly enriched in iron sulfide, mainly pyrite.

Size class: macrofossils

Collection methods: salvage, quarrying, sieve,

Primary reference: M. Böhme, M. Aiglstorfer, P.-O. Antoine, E. Appel, P. Havlik, G. Métais, Laq The Phuc, S. Schneider, F. Setzer, R. Tappert, Dang Ngoc Tran and D. J. Uhl Prieto. 2013. Na Duong (northern Vietnam) – an exceptional window into Eocene ecosystems from Southeast Asia. Zitteliana A 53:120-167 [P. Holroyd/P. Holroyd/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 169420: authorized by Patricia Holroyd, entered by Patricia Holroyd on 25.05.2015, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

 Cypriniformes - Cyprinidae
Barbinae indet. carp-like fish
"Barbinae gen. indet. sp. 1"
 Amiiformes - Amiidae
Amiinae indet. Bonaparte 1837 bowfin
 Testudines - Trionychidae
Trionychidae indet. Gray 1825 softshell turtle
more than 100 specimens of turtles
 Testudines - Pangeoemydidae
Banhxeochelys trani n. gen. n. sp.1
Banhxeochelys trani n. gen. n. sp.1 Garbin et al. 2019 turtle
 Crocodylia -
Orientalosuchus naduongensis n. gen. n. sp.2 Massonne et al. 2019 crocodilian
at least three types reported present from 50 specimens
 Perissodactyla - Rhinocerotidae
Epiaceratherium naduongense n. sp. Böhme et al. 2013 rhinoceros
 Ungulata - Anthracotheriidae
Bakalovia orientalis n. sp. Böhme et al. 2013 anthracothere