The Principles of Stratigraphical GeologyNote 55 — J. E. MARR, M.A., F.R.S. (continued 3)Reading editionCallaway, C., Quart. Journ. Geol. Soc., vol. XXXV. p. 643.◇Copy noteReturn to J. E. MARR, M.A., F.R.S. (continued 3)