HONEYMAN GEOLOGY OF ASTIGOXISHE COUNTY. 61 



of A, having lenticular beds of fossils. These have a thickness of 



feet. Succeeding these on the shore is trap, compact and 



tuffaceous. Then trap and altered strata of A are seen. The 

 trap then disappears. 



We have then a recurrence of the Hydrous silicates cf Alumina, 

 having brilliant yellow colours. Polished specimens of these are 

 very beautiful. There are also jasper, like serpentine, associated 

 with the Frenchman's Barn and trap of section No. 6. Beyond 

 this is the greatest amount of hydrous silicate of alumina rocks. 

 After their discovery, these were regarded by some as of probable 

 economic importance, and were consequently quarried to some 

 extent without realizing expectation. In these are veins having 

 the characters of true agalmatolite (Figure stone). After an 

 obscure interval we have again, trap, with an elevation to the 

 south, consisting of red porcellaneous rocks. After this comes 

 clay, which seems to overlie hydrous silicate of alumina rocks, 

 and to have been formed from them, and then the trap and jas- 

 pidibus rocks of Arisaig Pier — section No. 8. The rocks of A, 

 whether metamorphosed and non-fossiliferous, or partially metam- 

 orphosed and fossiliferous, do not extend beyond this. The latter 

 is not known to the west of the Frenchman's Barn, and it is only 

 fossiliferous, from Doctor's Brook outcrops on the road 200 feet 

 east of Doctor's Brook, and at the shore at McDonald's Cove, so 

 that this, the lowest member of the Upper Arisaig series, is very 

 limited. It does not occur elsewhere in the township of Arisaig. 

 Its next occurrence being at Marshy Hope and Lochaber Lake. 



Continuing the section, we have in the Cove the black lamina- 

 ted shales of B, Lower Clinton, having cone-in-cone concretions 

 and abundance of fossils. These terminate at the mill sluice of 

 Arisaig Brook, where strata of B' Upper Clinton commence. 

 These are lithologically unlike the strata of B. They are greenish; 

 while the others are black. They also shew distinct stratification, 

 by the alternation of slates and shales. These are exposed in low 

 sections along the shore, being overlaid by great accumulations of 

 drift. They are also seen on the beach at low water. They dip 

 with varying angles, and in different directions. One of the highest 



