GLACIAL DRIFT. 299 



and are the only prominent hills in this region. Nearly all of them have received 

 names, including Sweet and Brandy Brow hills, one and two miles east of Plaistow ; 

 Morse or Falls hill in East Kingston, and Buzzell, Martin, and Hog hills, crossed by 

 the east line of this township; Moulton Ridge, Hoosac, Round, Gove, Conner, Ward's, 

 Horse, and New Found hills in Kensington ; Cock and Great hills in Hampton Falls ; 

 and Indian Ground, Chair, Sawyer's, Aspen, and Bugsmouth hills in South Hampton. 



The longer axis of most of these hills noted in the west part of Rockingham county 

 trends to the south-south-east ; in Epping, Newmarket, and Brentwood, to the south- 

 east ; while those last described have almost invariably an east-south-east course. In 

 Kensington and South Hampton, besides this trend of separate hills, we may detect 

 their succession in two series which extend from north-west to south-east. One of 

 these embraces, in order, Buzzell's hill, Moulton Ridge, Hoosac, Gove, Conner, Ward's, 

 and Horse hills ; the other consists of Martin, Hog, Indian Ground, and Chair hills. 

 The two last named are double lenticular masses, the higher portion of each being at 

 the north-west. 



Lenticular Hills iti Massachusetts. These remarkable accumulations of till are very 

 abundant and conspicuous over the greater part of Essex county, Mass. The principal 

 exceptions to this are the east part of Salisbury ; Newburyport ; an area several miles 

 wide extending thence to the south-west ; Cape Ann, eastward from Essex river ; and 

 the vicinity of Salem. Prominent lenticular hills in this county are Grape, Beech, 

 Butts, Monday, and Powow hills in Salisbury, the last of which is perhaps their finest 

 type found in all our exploration ; Whittier's and Pond hills in Amesbury ; Bear and 

 Red Oak hills in Merrimac ; Great, Golden, Silver's, West Meadow, and Scotland 

 hills in Haverhill ; Bear hill in Methuen ; Reservoir hill in Lawrence ; Prospect hill in 

 Andover ; Gage's hill and others about Great pond in North Andover ; Hazeltine and 

 Dead hills in Bradford ; Bald Pate hill in Georgetown ; Long, Pipe Stave, Archelaus, 

 Ilsley's, and Crane Neck hills in West Newbury ; the Old Town hills in Newbury ; Ox 

 Pasture, Hundslow, and Prospect hills in Rowley; and Turkey, Bartholomew, Turner's, 

 Scott's, Town, Heartbreak, Plover, Sagamore, and Castle hills in Ipswich. Nearly all 

 of these come within the limits of the map of these deposits, presented in the atlas of 

 this report. Others occur farther south in this county. 



Lenticular deposits of till are also very conspicuous in the vicinity of Boston. They 

 form many of the islands in the harbor, and the numerous prominent hills that occur 

 in the city and for five miles to the north and west, in the towns of Winthrop, Revere, 

 Chelsea, Everett, Maiden, Medford, Somerville, Cambridge, Watertown, Brighton, 

 Newton, and Brookline. 



The trend of these hills in Essex county is prevailingly towards the south-east ; but 

 some of them vary from this to nearly north and south, while others have their longer 

 axis from west to east. Perhaps one fourth of them, however, are nearly round, hav- 

 ing no well marked trend. This form is rarely seen in New Hampshire. About Bos- 

 ton their course is quite uniformly from north-west to south-east. 



In the north part of Middlesex county lenticular hills of glacial drift are rare, but are 



