nS SIDNEY POWERS 



Quaco conglomerate); (3) the lithological character and the 

 lack of green laminae; (4) the delta character of the deposit 

 at Digby; (5) the basalt fragments decreasing in number with 

 increasing distance from the talus of North Mountain basalt; 

 (6) the horizontality of the stratification (the red and green 

 Triassic shales near Victoria Beach dip northward at an 

 angle of 3 ) . 



Rossway-Brier Island. — At Rossway on St. Mary's Bay (Fig. 

 30), there are excellent exposures of red shale, with occasional green 

 beds and red sandstone beds, comprising the Blomidon shale. 

 Rossway and Gulliver's Cove are connected by a valley which 

 marks a north-south fault similar to that at Bay View. The dis- 

 placement of the fault may be seen at Gulliver's Cove, in columnar 

 basalt. No thin flows are shown here, or along Digby Neck to 

 Brier Island. 



The Blomidon shales at Rossway have a thickness of about 

 500 feet. They dip northward at angles up to io°. No other 

 shales in the Acadian Triassic are as well consolidated. Ripple 

 marks, current undulations, cross-bedding, and rarely mud cracks 

 are seen in the shales. 



On the shore of Digby Neck, west of Rossway, the shales are 

 exposed for a mile, dipping under the basalt. Half a mile west of 

 the first exposure are Pleistocene clays containing black lignite 

 and basalt fragments. This clay may have been deposited in the 

 post-Wisconsin submergence. 



Digby Neck, Long and Brier islands show in common a depres- 

 sion in the center of the ridge, parallel to the strike of the lava 

 flows. This depression marks the amygdaloid at the top of the 

 lower flow, as portions of but two flows are shown above the sea. 

 No sedimentary rocks are shown on the St. Mary's Bay side west 

 of the exposure near Rossway. 1 



Cross-faults are shown between Digby Neck and Long Island, 

 and between Long Island and Brier Island. Another fault prob- 

 ably occurs between Brier Island and the submerged ledge on the 



1 A. Gesner described red sandstone exposed off Brier Island at low tide, but he 

 probably mistook either the red seaweed or a hematite stain over basalt for sandstone 

 {Remarks on the Geology end Mineralogy of Nova Seotia, Halifax, 1836). 



