16 Geology, ^c. of the Connecticut. 



ded crystals of porphyry are not of the same age with the 

 base. 



Granitic veins are numerous in many parts of the map. 

 Commence at Conway and go south, and they will be 

 found in abundance nearly to the ocean. North of this 

 town I have never noticed any. On the east side of Con- 

 necticut river, also, they are not unfrequent, particularly in 

 Connecticut. Many of the interesting minerals of Had- 

 dam and Chesterfield occur in them. 



Veins of quartz are sometimes seen in this region tra- 

 versing granite, as in Conway. But they are not extensive, 

 or numerous. I have noticed also that sometimes the gran- 

 ite contains, imbedded in it, masses of mica slate having a 

 curved form and not rounded ; as on the top of the high 

 hill between Williamsburg and Chesterfield. 



Graphic Granite. 



This is a rock not uncommon in the region of the map. 

 I shall notice two of the finest localities. The first is in 

 the red conglomerate, or coarse sand stone, passing through 

 Deerfield. The imbedded masses in this rock are some- 

 times the most beautiful graphic granite. The felspar, al- 

 though it retains its lustre most perfectly, appears to be 

 thoroughly penetrated by the colouring matter of the con- 

 glomerate so as to become of a deep flesh colour. The quartz 

 is gray and limpid, or a little smoky, and being arranged 

 somewhat graphically, many of the specimen are truly ele- 

 gant. 



The other locality of this rock, is the Goshen granite, 

 in the northeast corner of the town. The felspar is of a 

 snow white, and the quartz limpid; and so perfectly graphic 

 is its arrangement, that it bears a close resemblance to the 

 Chinese or Hindostanee characters which are frequently 

 observed on goods from the East-Indies. 



Porphyritic Granite. 



This handsome rock occurs in great abundance in loose 

 rolled pieces along the range of granite passing through 

 Leverett, &c. The crystals of felspar are from one to two 

 inches long, and a half or three quarters broad, and some- 



