Na Duong Mine layer 80b (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 and claystone

• interpreted as deep lake
• The lignite can be characterized as subbituminous coal to coaly shale

•(Wysocka 2009). Toward the top of the main seam, petrified driftwood occurs in high abundance, usually associated with yellowish, silty to sandy claystone interbeds of limited lateral extent (layers 80B, 80D), which preserve a rich fossil leaf flora.

Size class: macrofossils

Preservation: adpression, coalified

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 169421: authorized by Patricia Holroyd, entered by Patricia Holroyd on 25.05.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Bauhunia indet.
Angiospermae
  -
Angiospermae indet.
Angiospermae indet.
both toothed and entire margined leaves present
Polypodiopsida
  - Osmundaceae
Osmundaceae indet.
Osmundaceae indet. Berchtold and Presl