Sequence in layered rocks : a study of features and structures useful for determining top and bottom or order of succession in bedded and tabular rock bodies / Robert R. Shrock, Robert R. (Robert Rakes), 1904-1993. Rocks. Geology, Structural. Geology Fieldwork. QE431.5 .S45 552 SHS Includes bibliographical references and index. New York : McGraw-Hill Book Co., 1948. 1948. 1948 Text xiii, 507 p. : eng