24 ICE RECESSION IN NEW ENGLAND 



47. — 2 miles SE of Concord, bluff on the eastern side of the 

 sharp bend of the Merrimac River. 

 10 feet sand. 



2 feet disturbed varve clay. 



Sandy clay, often with lenses of sand, varves 6009-6095. 

 Very good, silty clay, varves 5914-6008. 

 13 feet talus down to river level. Depth to bottom unknown. 



Series measured: (5914-5974, 5980-6095). 

 The greater part of the curve shows typical variation, 

 but it has not been used in the construction of the 

 normal curve, since the varves are too thick. The 

 same is the case with many other sections in the 

 Merrimac Valley. 



48. — 1 mile SE of Concord, 400 yards E of the highway bridge 

 across the Merrimac River, just S of the highway. 



The clay is covered by 13 feet of sand. The uppermost 6 feet 

 of the clay are shdden. Depth to bottom is considerable. 



Series measured: (6267-6304). 



49. — % mile ESE of Concord, old brickyard on the eastern side 

 of the Merrimac River, at the bend. 



The clay is cove-ed by 3 to 6 feet of sand. Several varves 

 are sandy, and the thicknesses are not so good. At the 

 bottom of the pit the varves are thick and sandy, probably 

 indicating inconsiderable depth to substratum. Several 

 zones are slidden. 



Series measured: (5791-5830, 5794-5829, 5808-6047, 

 5839-5872, 5883-5937, 5948-5987)- 

 50. — 1 mile NE of Concord, bluff on the eastern side of the 

 Merrimac River, 500 yards N of the state highway 

 running from Concord eastward. 



Surface of wash plain. 



50 feet sand. 



Varve sand; 15 varves from 2 inches to 8 feet thick. 



16 feet covered by talus. 



At the level of the river varve quicksand; varves 8 inches thick. 



Thus far I have not been able to connect this section 

 with the normal curve. 



