The Principles of Stratigraphical GeologyNote 123 — J. E. MARR, M.A., F.R.S. (continued 5)Reading editionQuart. Journ. Geol. Soc., vol. XLVI., Proc., p. 59.◇Copy noteReturn to J. E. MARR, M.A., F.R.S. (continued 5)