Original published in D.F. Merriam, ed., 1964, Symposium on cyclic sedimentation: Kansas Geological Survey, Bulletin 169, pp. 623-630

Figure 1--Relation of baselevel to erosional and depositional surfaces: A, if baselevel is considered a "horizontal plane" (in part from Dunbar and Rodgers, 1957), and B, if baselevel is considered a single, ever-present, and worldwide "sphere" in response to changing patterns of sediment supply energy relationships.