Topographic features produced by prolonged stands of sea level are recognized at elevations of 215-250 and 90-100 feet. Stratigraphic evidence indicates that the 215-250-foot shore line was occupied during the Upper Miocene and the 90-100-foot shore line during the Pliocene. Lesser features probably representing briefer stands of sea level are distinguishable at elevations of 45-55 and 70-80 feet. The terrace associated with the conspicuous 25-30-foot shore line is underlain by deposits containing indubitably Pleistocene marine faunas. The shore lines at 45-55 and 70-80 feet can be interpreted as being either Pliocene or earlier Pleistocene interglacial, more likely the latter. The fluctuations of sea level recorded by the emergent shore lines correspond very well to the theory of glaciation proposed by Ewing and Donn.