Study of late Pleistocene sediments near the mouth of the Mad River revealed a sequence of nearshore marine and shallow bay deposits. This sequence, bounded by unconformities, is informally named the Mouth of Mad unit. The Mouth of Mad unit can be divided into four distinct depositional facies at the study site. The lowest facies is a nearshore sand that lies unconformably on a paleosol. The sand grades upward into a highenergy, interbeded sand-and-gravel facies containing storm and rip-channel deposits. Above the sand and gravel is a strand-plain sand facies. This sand is overlain by a laterally variable sequence...