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Tsagan Nor Basin (Oligocene of Mongolia)

Where: Mongolia (45.2° N, 101.6° E: paleocoordinates 46.7° N, 99.2° E)

• coordinate stated in text

• local area-level geographic resolution

When: Hsanda Gol Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; lithified, sandy claystone

• "the formation consists mostly of sandy clays" and figured frog specimen is embedded in lithified matrix (Noble 1924)

Size class: macrofossils

Preservation: original phosphate

Collected by Third Asiatic Expedition in 1925; reposited in the AMNH

Primary reference: X. Wang, M. C. McKenna, and D. Dashzeveg. 2005. Amphicticeps and Amphicynodon (Arctoidea, Carnivora) from Hsanda Gol Formation, Central Mongolia and phylogeny of basal arctoids with comments on zoogeography. American Museum Novitates 3483:1-57 [M. Uhen/M. Uhen/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 53977: authorized by Mark Uhen, entered by Mark Uhen on 20.09.2005, edited by John Alroy and Philip Mannion

Creative Commons license: CC BY (attribution)