41 



Wave ridges on slabs near the north end of Long island passage Wave 

 are transverse to a wave impulse from the north, others at the opposite m 

 end of this pass'age on Barachois harbour are tranverse to a wave 

 impulse from the west ; further south-west, along the shore of this 

 harbour, wave marks were observed transverse to an impulse from the 

 north-west. These different courses might indicate that Long island 

 was a barrier to the waves in Middle Cambrian time, but more obser- 

 vations are required to sustain such an hypothesis, for in the valley 

 of Indian brook, fourteen miles to the south-west of Barachois harbour, 

 wave-marks on the Johannian flags were found both parallel with and 

 transverse to the course of the valley through which that brook runs. 



McMullin brook, one of the feeders of Indian brook, is about two 

 and a quarter miles north-east of Dugald brook. It shows no section Johannian 

 of the Etcheminian terrane, but for the St. John terrane it supplies the MuUhfbrook 



section which is wanting on the latter brook. It has a devious course, j n 



11 /->i brook valley. 



but shows numerous beds of this part of the Cambrian rocks. As in 



the case of Dugald and Gregwa brooks, there are falls where it descends 

 from the Cambrian plateau to the level of Indian brook; but, while in 

 the case of the two latter brooks the cascades are at the contact of the 

 Coldbrook effusives with the Etcheminian, on McMullin brook it has 

 not cut so far back, but is toward the base of the Johannian division 

 of the St. John terrane. 



This stream is instructive in giving a section of the entire Johan- * 

 nian division which we did not meet with elsewhere in Indian brook 

 valley. The Etcheminian terrane does not appear in this section, 

 because the stream for a furlong above the lowest outcrop of the 

 St. John terrane runs through an alluvial flat. The first beds seen, 

 greenish-gray sandstones, with a thickness of 35 feet, are perhaps of 

 the former terrane. (See map on next page.) 



Following these are : Section on 



McMullin 

 30 feet hard gray conglomerate full of felsite pebbles. brook of 



Acadian and 



50 ; measures concealed. Here the road crosses. Johannian 



divisions of 



37 purplish gray felsite conglomerate, with fragments of tbe St. John 



purple felsite, passing upward into purplish red sand- group - 

 stone. 



38 " hard gray felsite conglomerate. 



40 " compact gray sandstone. Dip S. 20 E. mag. < 65 



195 " Measures of the Acadian Division. 



