Stratified alluvium at Coffee Bluff in Telfair County, Georgia records the transition from a braided to meandering channel pattern for the Ocmulgee River. Beneath cross-bedded sands which represent a braided stream depositional environment, an organic mat rich in plant macrofossils has been radiocarbon dated to 38,690 +/- 420 yr B.P. The well-preserved plant macrofossils in the dated deposit are dominated by species familiar in the area's contemporary floral communities. Laboratory analysis of a column of twelve samples from the overlying profile shows rapid changes in both mean grain size and sorting for the lower half of the profile, consistent with deposits of a braided stream. At approximately 1.2 m below the land surface there is a change to fining-upward depositional cycles in which both clay accumulation and sediment chemistry indicate a period of landform stability roughly coinciding with the Pleistocene-Holocene boundary at 10,000 yr B.P.