Geology, 4^c. of the Connecticut. 3 



granite of Norway and Scotland. Its texture varies from 

 the coarsest to the finest grain, and it exists here in most of 

 the forms that have been noticed. 



East-Haven Granite, 



The deposit of granite marked in East-Haven and Bran- 

 ford, has its southwestern extremity at the Lighthouse, 

 which stands on a sea beaten rock of this description. The 

 grain is intermediate between fine and coarse, and the fels- 

 par is usually reddish. In passing from East-Haven to 

 Branford, we find the granite immediately succeeding the 

 old red sand stone, or the slate rocks of the coal formation, 

 or the greenstone ; and all these rocks are nearly on the 

 same level. Their actual contact with the granite, howev- 

 er, has not been observed, being hid by geest. 



There is no evidence that this granite constitutes a bed 

 in other rocks : On the contrary, it would seem, that it was 

 brought to view along the coast by the abrasion of the 

 gneiss and mica slate, which appear a few miles to the 

 north, and which there lie at a much higher level. On 

 passing east and northeast from this granite deposit, well 

 marked beds of this rock appear; and perhaps all the gran- 

 ite which is found at the mouth of Connecticut river occurs 

 in this form. 



I do not know exactly how far the East-Haven granite 

 may be traced along the coast. Certainly the gneiss reach- 

 es the sound before we come to Connecticut river. 



In the cavities of this granite, when it is washed by the 

 tide, one or two species of Lepas and other testacea, have 

 fixed their abodes, finding security in those projecting crags 

 which are so appalling and dangerous to the mariner. Some 

 Ulvae and Fuel, also, are found along the shore. 



South Hampton Granite. 



Although the granite thus designated extends but a little 

 distance into South Hampton ; yet it contains the South 

 Hampton lead mine, which will, no doubt, be long an in- 

 creasingly interesting focus to which mineralogists will ha. 



