The general lack of microfauna or sedimentary bedding in the late Pleistocene to early Holocene Unit 2 complicates the interpretation of depositional environments for this unit. The poor sorting of the sand, the presence of floating pebbles, and the lack of
beach detritus may suggest an alluvial, proximal fluvio-deltaic or even coastal origin in relation to a nearby lacustrine fan delta (e.g. Horton and Schmitt, 1996; Olariu and Bhattacharya, 2006; Postma, 1990; Smith, 1991).