Than-u-daw, Pondaung Sandstone (Eocene of Myanmar)

Also known as Than-udaw AMNH A8

Where: Myanmar (21.7° N, 94.8° E: paleocoordinates 13.1° N, 93.3° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pondaung Formation, Bartonian (41.3 - 38.0 Ma)

• The whole sequence of units was originally defined as the ‘Pondaung Sandstones’ by Cotter (1914), but the horizon yielding Eocene vertebrate fossils is now known as the ‘Upper Member’ of the Pondaung Formation (see Maung et al. 2005). The most recent age for this unit is ~39–38 Ma and so it can be regarded as middle Bartonian (see Tsubamoto et al. 2011).

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; brown, yellow sandstone and red, white, yellow siliciclastic

• successive beds of cherry-red, bright buff and cream-white earths interstratified with brown or buff sandstones

Size class: macrofossils

Reposited in the AMNH

• collected by H. M. Lahiri, specimens housed in the Geological Museum, Calcutta and AMNH

•Colbert's list has both Pondaung and Upper Irrawaddy associated with the fossils he reports, but it's not clear what that means

Primary reference: G. E. Pilgrim and G. P. Cotter. 1916. Some newly discovered Eocene mammals from Burma. Records of the Geological Survey of India 47:42-77 [J. Alroy/E. Leckey/E. Leckey]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41180: authorized by John Alroy, entered by Erin Leckey on 07.07.2004, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

 Perissodactyla - Amynodontidae
Paramynodon birmanicus1 odd-toed ungulate
 Ungulata - Helohyidae
Pakkokuhyus lahirii n. gen.2 Pilgrim 1928 even-toed ungulate
right mandibular ramus containting the molar dentition
 Ungulata - Anthracotheriidae
Anthracotheriidae indet.4, "Anthracothema pangan" = Anthracotherium pangan4, "Anthracothema rubricae" = Anthracotherium pangan4, "Anthracokeryx myaingensis n. sp." = Anthracotherium tenuis4
Anthracotheriidae indet.4 Leidy 1869 anthracothere
fragmentary left mandibular ramus
"Anthracothema pangan" = Anthracotherium pangan4 Pilgrim and Cotter 1916 anthracothere
portion of a right maxilla with three molars, and some molars from the left side of the same palate as well as a part of the symphyseal region
"Anthracothema rubricae" = Anthracotherium pangan4 Pilgrim and Cotter 1916 anthracothere
right mandibular ramus
"Anthracokeryx myaingensis n. sp." = Anthracotherium tenuis4 Pilgrim and Cotter 1916 anthracothere
isolated teeth
 Ungulata - Archaeomerycidae
Irrawadymeryx pondaungi n. gen. n. sp.3
Irrawadymeryx pondaungi n. gen. n. sp.3 Métais et al. 2007 ruminant
TUDW-20061 - holotype