254 Professor R. A. Daly — - 



the " lower Cape May terrace " does not rise beyond the 20 ft. 

 contour. Is there evidence of such a halt in the emergence of the 

 Talbot formation ? ^ 



Similarly, the lower division of the Pensacola terrace in Florida, 

 like the Satilla terrace in Georgia, seems to correlate with the 

 Recent 20 ft. eustatic shift. The Pensacola terrace " is a broad 

 plain, rising less than 40 feet above sea level, and apparently 

 including two divisions, one being less than 20 feet above, and the 

 other from 20 to 40 feet above sea level." ^ The greater part of the 

 Satilla terrace, which merges into the Pensacola terrace, " is 15 to 

 25 feet above sea level, but there are a few places which reach an 

 elevation of about 40 feet. ... If the coast region were uplifted 15 or 

 20 feet above its present elevation, a plain now submerged beneath 

 the ocean waters would apjDear as an emerged terrace lying east of 

 and parallel to the Satilla terrace, and separated from it by an 

 escarpment. This plain would be analogous to the Satilla plain 

 in all its essential features."^ Since the Pensacola-Satilla terrace 

 keeps a practically uniform set of levels for an air-line distance of 

 500 miles, the hypothesis of its emergence by crustal uplift seems 

 hardly credible. 



Florida Keys and West Indies. — Vaughan has deduced a recent 

 sinking of sea-level of from 10 to 15 feet along the coral-reef keys 

 of Florida, and " perhaps 10 to 20 feet " along the keys west of 

 Bahia Honda. ^ He described New Providence Island of the Bahama 

 group as " mostly a platform from sea-level to 20 feet in elevation ", 

 and the neighbouring Andros Island as having the same range of 

 emergence. On New Providence Island he discovered a wave-cut 

 scarp at 10 feet above " water-level ", and other benches at only 

 3 or 4 feet above the sea, but he also found a sea-cave at Nicollstown 

 Light, which indicates an emergence of about 18 feet.^ This case 

 of apparent conflict in the testimony of bench and sea-cave as to the 

 amount of level-shifting is strikingly like that at Tutuila, Samoa, 

 already described. 



In Cuba the Seboruco " reef " represents a recent " uniform " 

 emergence ; it " borders the coast in most places " and constitutes 

 many islets surrounding the main island. " Generally these are 

 low, standing only a few feet above the water." In Jamaica Hill 

 found " elevated reefs " at 25 feet and 10 feet above " sea-level ", 



' Cf. M. Fuller, Prof. Pa]3er No. 82, U.S. Geol. Surv., 1914, p. 222. 



2 G. C. Matson and S. Sanford, Water-supply Paper No. 319, U.S. Geol. 

 Surv., 1913, p. 34. 



3 0. Veatch and L. W. Stephenson, Bull. 26, Geol. Surv. of Georgia, 1911, 

 pp. 36, 437. 



■* T. W. Vaughan, " A Contribution to the Geological History of the 

 Floridian Plateau " : Papers of the Marine Laboratory, Carnegie Institution 

 of Washington, 1910, p. 180. " Preliminary Remarks on the Geology of the 

 Bahamas " : ibid. 1914 p. 50. Yearbook No. 13, Carnegie Institution of 

 Washington, 1914, p. 230. 



