Original published in D.F. Merriam, ed., 1964, Symposium on cyclic sedimentation: Kansas Geological Survey, Bulletin 169, pp. 1-20

Figure 6--Graphic plot of Beaverhill Lake Formation (Devonian) data showing changes in varve thickness, times of high and low carbonate deposition, and spacing of scour breaks. Note regularity of thickness trends in first half and change to irregularity in second half as scour becomes intensified.