62 THE POST-PLIOCENE PERIOD. 



Point Pleasant, and other places near Halifax, 



exposure south, very distinct striae, 

 Head of the Basin, exposure south, but in a 



valley, .... 



La Have River, exposure S.E., 

 Petite River, exposure S. 

 Bear River, exposure N., 

 Rawdon, exposure N., 

 The Gore Mountain, exposure N., two sets of 



striae, respectively, . . 

 Windsor Road, exposure not noted, 

 Gay's River, exposure N., 

 Musquodoboit Harbour, exposure S., 

 Near Pictou, exposure E., in a valley, 

 Poison's Lake, summit of a ridge, . 

 Near Guysboro', exposure not noted, 

 Sydney Mines, Cape Breton, exposure S. 



The above instances show a tendency to a southerly and south- 

 easterly direction, which accords with the prevailing course in most 

 parts of North-eastern America. Local circumstances have, however, 

 modified this prevailing direction ; and it is interesting to observe 

 that, while S. E. is the prevailing direction in Acadia and New 

 England, it is exceptional in the St Lawrence valley, where the 

 prevailing direction is S.W.-j- Professor Hind has given a table of 

 similar striation in New Brunswick, showing that the direction ranges 

 from N. 10° W. to N. 30° E., in all except a very few cases. On Blue 

 Mountains, 1650 feet above the sea, it is stated to be N. and S. As 

 in Nova Scotia, N. "W". and S. E. seems to be the prevailing course. 



The travelled and untravelled boulders are usually intermixed in 

 the drift. In some instances, however, the former appear to be most 

 numerous near the surface of the mass, and their horizontal distribution 

 is also very irregular. In examining coast sections of the drift, we 

 may find for some distance a great abundance of angular blocks, with 

 few travelled boulders, and then we may observe a portion of the 

 shore or bank in which both varieties are equally intermixed, or in 

 which travelled boulders prevail ; and we may often observe particular 

 kinds of these last grouped together, as, for instance, a number of 

 blocks of granite, greenstone, syenite, etc., all lying together, as 

 if they had been removed from their original beds and all deposited 



* The above and other courses in this volume are magnetic, the average variation 

 being about 18° W. 

 f Logan, " Keport on Geology of Canada." 



