﻿4:0 N. S. Shaler — Geology of Cobscook Bay District, Me. 



Locality. Strike. Dip. 



Near Dennysville N.W. E. 1 5-30°. 



Near Denbo Point N. 10 W. E. 42. 



E. 45. 



E. 10-30. 

 E. 22. 

 S. 15-30. 

 E. 35. 

 E. 20-35. 

 E. 32. 

 E. 25-30. 

 E. 40. 

 N. 20-30. 

 S.E. 20-40. 

 E. 20. 

 E. 30-50. 

 E. 30-50. 

 E. 28. 

 E. 50. 

 E. 20. 

 E. 30-40. 



At many points the igneous rocks which seem to be inter- 

 bedded among the stratified deposits may be seen in what ap- 

 pear to be massive strata, often a hundred feet or more in 

 thickness, having the same general dip as the rocks between 

 which they lie. At no points are the upper and lower con- 

 tacts of these igneous masses and the stratified beds clearly 

 enough seen, or at least well enough studied, to make it pos- 

 sible to determine the question whether they were injected be- 

 tween the beds or were contemporaneous deposits. 



The igneous rocks of this district may be. divided into three 

 classes : 1st. Detrital igneous rocks, those which are com- 

 posed of fragmentary materials which have fallen through the 

 air. 2d. What seem to be true lavas, i. e. those which have 

 flowed over the superficial rocks. 3d. Dykes which traverse, 

 strike or penetrate between previously existing beds of sedi- 

 mentary or igneous origin. 



a a a 



" Bay . 



_. N. 



N. 15 W 



it a 



N.W. 



a a 



N. 90 E. 



a u 



N. 



a a 



N. 



a a 



_ N. 



u a 



_ N. 



u a 



.._'_ N. 40 E. 



Pembroke River _ 



it u 



u u 



Johnston's Bay 



Shore 



Fall Island 



.- E. & W. 



N. 45 E. 



_ N. 



_. N. 



N. 45 W. 



_ N. 45 W 



Orange Bay __ 



Ct u 

 Ct c< 



N. 



N. 30 W. 



... N. 



Diagramatic section of shore 1£ miles N.W. of Red Island. Length 300 ft. 

 A, greenish diorite. B, greenish and gray flags and slates, with obscure fossils. 

 C, high tide line. 



The distinctly fragmental deposits, volcanic ashes in general 

 character, are most abundantly exhibited in that part of Cobs- 

 cook Bay which forms the channel immediately to the west- 





