NANTASKET AND COHASSET. 
INTRODUCTION. 
lr is obvious upon the most casual observation that the town 
of Hull, Mass., which is virtually an island, being joined to the 
main land of Cohasset only by the narrow barrier beach con- 
necting the Green Hill drumlin with the granite ledges along 
the Jerusalem Road, is sharply divided into two districts which 
are very strongly contrasted in their topographie and geologic 
features. In the order of geologic age and interest these аге: 
(1) The highly irregular, broken and rocky tract, commonly 
known as Nantasket, which forms the southern extremity of the 
town, adjoining the mainland, and is almost completely isolated 
by Strait’s Pond, Weir River S Nantasket Harbor and. the 
Atlantic. (2) The narrow, and, at some points, extremely 
slender peninsula stretching from е Hill north-northwest 
for more than three miles to Point Alle rton, whence, turning at 
а right angle, it extends to the westward two miles further to 
Pemberton and Windmill Point. This peninsula thus embraces 
Nantasket Beach and the Vill: age of Hull; and, with the excep- 
tion of the single ledge of slate on the south side of Thornbush 
Hill, near the Village, it is composed entirely of rounded drift 
hills or drumlins and the connec ting beaches of sand and shingle. 
The div iding line between these two districts is where the sands 
of the beach rest against the rocky northern base of Atlantic 
Hil. 
Although the main purpose of this paper is to set forth the 
results of a detailed study of the intricate geologic structure 
exhibited in the m: ienificent, rock exposures of the southern area 
OCCAS. PAPERS B. 8. N. H. IV. 1 
