22 THOMAS L. WATSON 



tered, within a few feet of each other. The third and fourth 

 beaches are found at the same elevation, lOO feet, and about 

 equally distant from the opposite sides of a rock-basin lake 

 which has been formed in the intersection of this, with a second 

 valley, whose direction is N. 53°. 5 E. The fifth beach is found 

 at an elevation of 75 feet, and at a distance of about 165 yards 

 from the fourth one, with an average width of some 60 feet. 

 This is the last well -developed beach in this valley, though 

 there are two fragmentary ones found at the respective eleva- 

 tions of 55 and 50 feet above sea. These are located on the north 

 side of and at a short distance from a second small lake, whose 

 surface is 60 feet above sea and 75 yards from the fifth beach. 



In the southwest half of the valley, which has been mentioned 

 above as crossing the one just described, are found two well- 

 developed beaches at the respective elevations of 50 and 75 

 feet, which are correlated with the two corresponding beaches in 

 the above series. 



In the next valley immediately beyond, eastward, and 

 approximately parallel to the one trending S. 13°. 5 W., is found 

 the largest, and by far the best-developed, beach seen on the 

 island. It is distinctly a sand and gravel beach, 40 feet high, 

 with its crest 175 feet above sea, and about 120 feet wide by 330 

 long. It serves as the divide in its valley, and is the correlative 

 of the 175-foot beach in the first series. 



Proofs of elevation in differential weathering and unlike surface con- 

 ditions. — The fact of recent elevation of this island does not rest 

 alone upon the evidence of raised beaches, though this, to be sure, 

 is entirely satisfactory in itself. It is confirmed by other geolog- 

 ical evidence of a very strong nature. Apparently there exist 

 on this island two sharp and well-defined zones, whose surface 

 conditions, in nearly every respect, are very markedly different 

 from each other. The first zone, which begins at present sea- 

 level, and has its upper limit about 300 feet above sea, includes 

 all the land below that level. This zone includes the hilltops 

 for a distance of from two and one-half to three miles back from 

 the sea, and the bottoms of all the major valleys observed on 



