STRIKE AND DIP. 



331 



Divisional Planes. 



A few observations respecting joints, cleavage and foliation planes, have been recorded. Jointed planes 

 are quite common, crossing the strata. The following are a few of them : 



Locality. 



Milton, northwest corner, 

 Milton, northwest corner, 

 Burlington, Redrock Point, 

 Burlington, Redrock Point, 

 Burlington, Redrock Point, 



Strike. 



N. 20 E., most common, 



N.55E., 



N. 50 E., most common, 



N. 25 E., 



E. and W., 



90, 

 90, 

 90, 

 90, 

 90", 



Olserver. 



C. H. H. 

 C. H. H. 

 C. H. H. 

 C. H. H. 

 C. H. H. 



At the last locality there were several perpendicular excavations in the ledge, which run N. 50 W. 

 They are from three to twelve feet in width. They appeared much as if dikes of igneous matter had once 

 filled them. But the absence of any evidences of trap and porphyry in them lead us to suppose that they 

 were washed out by the water of Lake Champlain between parallel joints like some of the fiords upon our 

 coast ; for example, the so-called Purgatory at Newport, E. I. The east and west system of joints crosses 

 these fiords transversely. 



Cleavage planes as well as joints are abundant in this rock, but the number of observations of both these 

 structural peculiarities is miserably small in proportion to their importance. 



STRIKE AND DIP OF THE STRATA. 



Locality. Strike. 



Charlotte, Mutton Hill, N. 20 W., 



Richmond, northwest part, N. 10 E., 



Highgate Falls, N. 30 E., 



Benson, and Orwell, 



Bridport, northeast part, N. 20 E., 



Top of Snake Mountain Addison, 



Addison, top Snake Mountain, 



Addison, northeast part, N. 20 E., 



Waltham, west part, N. and S., 



Waltham, west part, N. and S., 



New Haven, southeast of village, N. 10 E., 



New Haven, north of village, N. 10 E., 



New Haven, east of village, East of north, 



Monkton, south part, N. 30 E., 



Monkton, near R. Baldwin's, N. 30 E., 



Monkton, near do., N. 60 W., 



Monkton, east part, N. and S., 



Monkton, southwest part, N. and S., 



Monkton, southwest corner, N. 10 E., 



Monkton, northwest corner, N. and S., 



Monkton, northwest part, N. and S., 



Monkton, Oven, 



Monkton, between east and west lines of the town, there are four anticlinals and four or five 



synclinals, running N. and S. through the town, into Hinesburgh, 

 A multitude of observations there need not be added to this list. 



North Ferrisburgh, About N. and S., 4-5E., 



Charlotte, near village, N.20W., 43 E., 15 E., 



Charlotte, T. A. Williams', N. 15 W., 16 E., 



Charlotte, D. Ball's, N.45E., 80S.E., 



C.H.H. 



C. H. H. and E. H., jr. 

 C. H. H. and A. D. H. 

 C. H. H. and A. D. H. 

 C. H. H. and A. D. H. 



