ELIZABETHTOWN AND PORT HENRY QUADRANGLES 



17 



about the width shown, making the marked secondar}' sheared band 

 which crosses it. The broken blocks in the lower right-hand and 

 upper left-hand corners appear to correspond fairly well. 



Brecciated exposures such as this have been met from time to 

 time elsewhere. A quarter of a mile north of Cheever dock on 

 Lake Champlain, and in granitic gneiss of the syenite series, there 

 is another one beautifully exposed in the cuts of the railway. The 

 fault has broken the brittle gneiss to a mass of angular bits, of 

 which the individuals range up to 2 or 3 inches across and are 

 cemented by finely crushed and chloritized material. In these 

 brecciated exposures it is not always easy to detect the exact line 

 of movement, since the result is chiefly the brecciation, but the 

 attendant sheeting in the case just cited runs northeast. 



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Fig. 13 Faulted gabbro and basaltic dikes in anorthosite, northeast corner of Elizabeth- 

 town quadrangle 



Occasionally a fortunate combination of contrasted formations 

 and faulting gives a clue to the nature and amount of the displace- 

 ment. One such case is to be seen in the bed of the Boquet river 



