4 GUIDE TO LOCALITIES. 



Provincelands and southward beyond Chatham to Mononioy. A 

 two-day trip from Boston, across Massachusetts hay and back by 

 steamer, with two half-days about Provincetown, will repay richly 

 any geologist from the interior, to whom the features of a strongly- 

 worked shore line are a novelty. By driving at once to Highland 

 light, on the arrival of the boat in Provincetown, several afternoon 

 hours may be enjoyed on the bold bluff and the superb beach below 

 it. Facetted or wind-carved pebbles may be gathered in abundance 

 just north of the signal station on the bluff. "While returning to 

 Provincetown, a walk over the upland leads to High Head, the 

 northernmost point of the mainland of the cape, whence the long 

 curved spit of the Provincelands stretches to the northwest, bear- 

 ing extensive sand dunes, old and new, tree-covered and bare. 

 From the same point a good view is gained of the abandoned sea 

 cliffs of High Head, now enclosed by the sand reefs and marsh of 

 the Provincelands. Near by, the cliffs cut by the waves of Cape 

 Cod bay make an obtuse angle with the abandoned cliffs. The 

 following morning, a pleasant walk leads out to the great dunes 

 that are invading the forest northwest of the village. The action 

 of the wind in building may be studied here to great advantage. 

 (See also Palaeontology, p. 48.) 

 Literature. 



Davis, W. M. — Facetted pebbles on Cape Cod, Mass. (Bos. Soc. Nat. 

 Hist., Proa, vol. 26, pp. 166-175.) 



Davis, W. M. — The outline of Cape Cod. (Am. Acad. Arts and Sci., 

 Proc, vol. 31, pp. 303-323.) 



Grabau, A. W. — The sand plains of Truro, AVellfleet and Eastham. 

 (Science, new ser., vol. 5, pp. 334-335.) 



Upham, W. — The formation of Cape Cod. (Am. Nat., vol. 13, pp. 

 489-502, 552-565.) 



COASTAL PLAIN OF MAINE. 



The composite topography of the coastal district of Maine is 

 shown well from the summit of Blackstrap hill, a large drumlin 

 six or eight miles northwest of Portland. The general evenness of 

 the skyline can be seen to the east and west ; a number of monad- 

 nock-like mountains rise above it in the north, Mount Washington 

 being one of the farther summits. The uplands, generally com- 

 posed of crystalline schists, are dissected thoroughly into rockv 

 ridges, separated by wide-open valleys that have been worn to a 

 depth of several hundred feet. It is believed that these valleys 



