RIVER TERRACE DEPOSITS

Age: Quaternary Period, Pleistocene Epoch
Distribution: Arkansas River Deposits
Geology: The terrace deposits include a complex sequence of unconsolidated gravels, sandy gravels, sands, silty sands, silts, clayey silts, and clays. The individual deposits are often lenticular and discontinuous. At least three terrace levels are recognized with the lowest being the youngest. Fossils are rare. The lower contact is unconformable and the thickness is variable.