PBDB Collection

Na Duong Mine layer 80 (Eocene to of Vietnam)

Where: Lang Son, Vietnam (21.7° N, 107.0° E: paleocoordinates 21.7° N, 105.9° 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 and Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Actinopteri
Amiiformes - Amiidae	Amiinae indet. Amiinae indet. Bonaparte 1837 bowfin
Cypriniformes - Cyprinidae	Barbinae indet. Barbinae indet. carp-like fish "Barbinae gen. indet. sp. 1"
Reptilia
Crocodylia -	Orientalosuchus naduongensis n. gen. n. sp.⁴ Orientalosuchus naduongensis n. gen. n. sp.⁴ Massonne et al. 2019 crocodilian at least three types reported present from 50 specimens
Crocodylia - Gavialidae	Maomingosuchus acutirostris n. sp.² Maomingosuchus acutirostris n. sp.² Massonne et al. 2021 crocodilian GPIT-PV-31657 - holotype
Testudines - Pangeoemydidae	Banhxeochelys trani n. gen. n. sp.¹ Banhxeochelys trani n. gen. n. sp.¹ Garbin et al. 2019 turtle
Testudines - Trionychidae	Trionychidae indet., Striatochelys baba n. gen. n. sp.³ Trionychidae indet. Gray 1825 softshell turtle more than 100 specimens of turtles Striatochelys baba n. gen. n. sp.³ Massonne et al. 2023 softshell turtle GPIT-PV-112860, carapace, xiphiplastron, thoracic vertebrae (GPIT-PV-112860-1) and partial plastron (entoplastron, GPIT-PV-112860-2; hyoplastron right, GPIT-PV-112860-3; hyoplastron left, GPIT-PV- 112860-4; hypoplastron right, GPIT-PV-112860-5) and further postcranial material (cervical vertebra, GPIT-PV- 112860-6; left pectoral girdle, GPIT-PV-112860-7; left humerus, GPIT-PV-112860-8; right radius, GPIT-PV- 112860-9; right ulna, GPIT-PV-112860-10; phalanx, GPIT-PV-112860-11).
Mammalia
Perissodactyla - Rhinocerotidae	Epiaceratherium naduongense n. sp. Epiaceratherium naduongense n. sp. Böhme et al. 2013 rhinoceros
Artiodactyla - Anthracotheriidae	Bakalovia orientalis n. sp. Bakalovia orientalis n. sp. Böhme et al. 2013 anthracothere

¹Garbin et al. 2019; ²Massonne et al. 2021; ³Massonne et al. 2023; ⁴Massonne et al. 2019