132 F. Ward — Lighthouse Granite near New Haven, Conn. 



ledges : sandy beaches are not common except in the western 

 portion. Inland, between the areas of salt marsh, the low hills 

 have the smooth, rounded outlines commonly seen in this gla- 

 ciated region : they are usually well wooded, and the slight 

 depressions between them are freely sprinkled with fresh- 

 water swamps. These hills show numerous outcrops. Four 

 or five small quarry openings and a few open cuts along the 

 trolley lines afford an opportunity of seeing the rock below 

 the surface. 



Historical. 



The region has been known geologically in a broad way 

 from very early times. The first geological map of the eastern 



Fig. 1. 



.& & 



3 



K,ng ld <^GS§ 



* 





andy^Pl 



\t 



£ 





V 











S\ 







U|£ht House P 



Branford 

 dran'ttm. 



United States'* has Connecticut colored in with "Primary" 

 and "Secondary" rocks, referring to crystallines and Triassic 

 respectively. In the nature of the case there could be no 

 specific description of any part of the crystallines. 



E. Hitchcock,f in a description of the formations on each 

 side of the Connecticut river from Vermont to the Sound, 

 makes a separation of the granites from the other rocks, but 

 maps all the granites from Lighthouse Point to Guilford as 

 one formation. 



* W. Maclure, Amer. Phil. Soc. Trans., vi, p. 411, and map, 1809. 

 f This Journal (1), vi, 1823. 



