43 



25 feet greenish gray conglomerate with felsite fragments and 

 felsitic sand. 



45 " fine-grained gray shale and earthy sand.- tone. Dip S. 40 

 E. mag < 65 1 At the top of this band is a bed 

 of quartzite one foot thick, on the underside of which 

 are moulds of the burrows of Arenicolites, tracks of 

 worms, and trails of Ctenichnites (n. sp). 



65 " compact gray slate and some quartzite. Across two small 

 falls to the main fall of this brook. 



80 " same rocks in gorge below the fall. Here the flags have 



wave marks 3 inches between crests. 

 160 " similar rocks. Dip < 65. 

 165 " gray clay slate and flags. 

 145 " same rocks, Claw marks of crustaceans. 



60 " same rocks, with wave-marked layers. Dip S. 25 E. 

 mag. < 80. 



60 " . gray slates and quartzites. High cliff in the right bank. 

 280 " same kind of rocks. Sides of the valley are lower. 



60 " measures concealed except some slates and flags in the 

 left bank. 



75 " intervale flat of Indian brook. 



1220 " Measures of the Johannian Division. 



On comparing this section with that on Boundary brook three miles Compared 

 to the south-west given on a former page, there appears a similar a t Boundary 

 series of felsite-conglomerates in the Acadian division of the St. John brook - 

 group, but as the intervening shales or slates and sandstones do not 

 correspond in thickness in the two sections, satisfactory correlation of 

 the conglomerates cannot be made ; the conglomerates, however, are 

 similar in kind and the difference in thickness is not very great. In 

 the vicinity of the falls, both above and below them, the strata 

 exposed are characteristically those of Division 2 Johannian, and 

 contain trails of Ctenichnites, and trails and burrows of worms, such 

 as are met with in the rocks of this division elsewhere. The group, 

 however, shows a much greater width here than on Boundary brook, 

 where a large part of its mass is cut out by the great fault running 

 along the east side of Indian brook valley. At McMullin brook this 

 division shows a full thousand feet in thickness of measures, and is 

 thus as bulky as in typical sections in the city of St. John in New 

 Brunswick. 



