200 SURFACE GEOLOGY. 



It would be difficult to decide what was their prevailing direction. Multitudes ran due 

 east and west ; some few, north and south ; some, N. io° W. ; some, N. io° E. ; many, 

 N. 70° and 80° W. ; many, N. 70° and 80° E. No theory of mountain slides could 

 explain this remarkable scratching : the situation seemed to forbid such an explanation. 

 These observations were made on many different ledges, but all of them within half a 

 mile of each other, and within a mile of the north end of the ridge. When a rapid 

 stream, with a current of three miles an hour, passes a rock in its bed, water will flow 

 around the rock and meet on its lower side. Do not these irregular striae indicate a 

 changeable and eddying current inconsistent with the motion of a glacier? 



Mts. Kearsarge and Ragged. 



Mts. Kearsarge and Ragged rise abruptly from a comparatively level 

 country, like Monadnock, but, being situated near each other, not quite 

 six miles apart, the conditions gave rise to a different motion of the ice. 

 Ragged is not so completely isolated as Kearsarge, being connected with 

 mountains in the north part of Andover. Sutton, Salisbury, and Hill 

 have the average direction for striae of about S. 12° E., while in Warner 

 there are several degrees more of easting. The parts of Wilmot and 

 New London next to Kearsarge do not show striated ledges. Starting 

 from Warner, on the south, the table shows the change from S. 20° E. to 

 as high as S. ^6° E., it being nearly south-east on the summit. On fol- 

 lowing down the north side, the easting falls off to S. 36° E. at the Wins- 

 low house, but reaches N. 6^° E. in the valley by Potter Place. Similar 

 figures continue all the way to the top of Ragged mountain from the 

 southern base. At the last house, — 1,100 feet (450 feet above Potter 

 Place), — the striae run S. 71° E.; at 1,340 feet elevation, S. 31° E.; at 

 1,650 feet, S. 46° E.; at 1,775 feet, S. 23° E.; the same for 200 feet fur- 

 ther; at 2,000 feet, S. 36° E.; at 2,100 feet, S. 23° E. and S. 51° E. Here 

 the embossed ledges are numerous, while the striae are much worn. The 

 S. 50° E. course appears higher up, but not on the summit or at the sig- 

 nal, 2,256 feet, where the direction S. 23° E. is to be seen. We have, 

 therefore, two well marked directions, very much as on Monadnock, the 

 S. 23° E. course appearing by itself on the summit, while the south-east 

 lines show themselves all the way down the south slope. 



Considerations will be presented soon, showing that there was some- 

 what of a local or valley movement of ice down the Blackwater river. It 

 may be that the greater eastings of the striae about Potter Place are 



