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

Figure 7--A, Thin section of silicified laminated bed in Monterey Formation,. Dana Point, California, showing clay-organic laminations (X 20). B, Thin section of nonlaminated shale bed in Monterey Formation, Dana Point, California, showing silty unlaminated texture (X 40).