Gateway to the Paleobiology Database
Ban Sa (Miocene to of Thailand)

Also known as Chiang Muan Basin

Where: Thailand (18.9° N, 100.3° E: paleocoordinates 17.6° N, 99.9° E)

• coordinate based on nearby landmark

When: MN 7 + 8 to MN 7 + 8 (12.8 - 9.7 Ma)

• "Middle Miocene": upper and middle lignite seams are in a normal polarity zone correlated with anything between chron C5ABn and chron C5n, but equivalent to "the top of... MN 8 and the base of MN 9" according to Pickford et al. 2004

• member-level stratigraphic resolution

Environment/lithology: mire or swamp; lignite and mudstone

• "Paleosols indicate some climatic seasonality... vegetation corresponded to a mosaic of freshwater swamps [presumably yielding the lignites], with a Syzygium-dominated lowland forest"
• "The sediments consist mainly of mudstones and sandstones incalated with paleosols and several lignite beds [yielding the fossils]"; section shows a long interval of "purple mudstones" separating the lower and middle plus upper lignite seams, with the latter separated by "purple mudstones" and "sandy clays"

Size class: macrofossils

Collection methods: specimens have "TF" museum numbers and clearly derive from different collections than the "CMu" material collected by the Japan-Thailand Paleontology Expedition from the Chiang Muan Basin

Primary reference: Y. Chaimanee, D. Jolly, M. Benammi, P. Tafforeau, D. Duzer, I. Moussa, and J.-J. Jaeger. 2003. A Middle Miocene hominoid from Thailand and orangutan origins. Nature 422:61-65 [J. Alroy/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 71580: authorized by John Alroy, entered by John Alroy on 29.04.2007

Creative Commons license: CC BY (attribution)