ammonites
Subeng Unit 3 (Mammal Site) (Paleocene of China)

Where: Nei Mongol, China (43.5° N, 111.7° E: paleocoordinates 44.5° N, 102.9° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Bayan Ulan Beds Member (Nomogen Formation), Gashatan (58.7 - 55.8 Ma)

• all fossils are apparently from one "horizon" well under 1 m thick, but it apparently contains several distinct pebble layers

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; paleosol/pedogenic, concretionary conglomerate

• "marginal lacustrine/fluvial system that is a part of the lake during high lake levels. During low lake levels, soils are formed within the subaerially exposed sediments [yielding the fossils] and fluvial activity reworks the altered sediments"
• "pebble layers... consisting of pedogenic carbonate nodules forming a conglomerate... coarser levels [that] contain a mixture of [well rounded] mud pebbles varying from 1 to 10 mm in size and sandsized [white to yellowish] carbonate particles"

Size classes: macrofossils, mesofossils, microfossils

Collection methods: bulk, sieve,

• sediment was "screenwashed for vertebrate fossils"

Primary reference: J. Van Itterbeeck, P. Missiaen, A. Folie, V. S. Markevich, D. Van Damme, D.-Y. Guo, and T. Smith. 2007. Woodland in a fluvio-lacustrine environment on the dry Mongolian Plateau during the late Paleocene: Evidence from the mammal bearing Subeng section (Inner Mongolia, P.R. China). Palaeogeography, Palaeoclimatology, Palaeoecology 243(1-2):55-78 [J. Alroy/J. Alroy/M. Carrano] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 71076: authorized by John Alroy, entered by John Alroy on 17.04.2007, edited by Chris Beard

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)