34 



History of Hingham. 



which extends along the left side of the road for a distance of 

 about 120 feet. It varies in width from fifteen inches to nearly 

 two feet, and is much distorted. The general direction is, how- 

 ever, east and west. It may be traced nearly the whole length of 

 the ridge. 



About 2,000 feet beyond this, going from Lasell Street, another 

 dike occurs which crosses the street diagonally. It may be seen 

 on both sides of the roadway in the granite, and may be traced 

 into the adjoining field on the left seventy-five feet or more from 

 the fence. Its width is about three and a half feet; its direction 

 east and west. See Figure No. 1. The crosses (x x) represent 

 exposures of the granite. 



I 



/ 



45 ft. from Me 





X 



XX 



X 



XXX 



X X 



6 ft. between 



20 ft between 



A *»X X X 



STREET 



Dike about 3% ft. wide. 

 Traceable about /OO feet. 



Figure jSTo. 1. 



Old Colony Hill. — Proceeding from the harbor on Summer 

 Street towards and up the slope of Old Colony Hill, there may be 

 seen on the right side just above the surface a small exposure of 

 trap, being part of a dike which passing east is lost to sight by 

 the covering earth, but which again appears just in front of Mr. 

 Bouve's stone wall, near the corner of Rockland Street. Here it 

 presents a flat face upon which may be observed numerous glacial 

 stride. The distance on the street is about 250 feet. From here 

 the dike is lost to view for 130 feet, but may be found in an east- 

 southeast direction upon the adjoining field, where it continues 

 above ground 85 feet. It then again sinks below the surface, but 

 reappears 190 feet further on in the same direction, and there 

 shows an exposure of about 160 feet before finally disappearing. 

 The whole length as thus presented is 815 feet. The width of 

 the trap as it appears above the soil varies from five to twelve 

 feet. 



Hull Street. — Two trap dikes, one three feet wide, the other 

 over four feet, were observed on this street. Their direction was 

 found to be east and west, but irregular. 



