Mesozoic and Ccenozoic Geologi/ and Paloiontology. 161 



occup}' the whole of the cliff". It thus appears that the trap at Blorai- 

 don is a comformable bed, resting on the sandstone, exactly as in some 

 places ou the opposite shore. 



The coast section between Blomidon and Horton, as seen near Pereau 

 river and Bass creek, and at Starrs Point, Long Island and Bout Is- 

 land, exhibits red sandstones, with northwest dips at angles of about 15 

 degrees, and precisely similar in mineral character to those of Blomidon, 

 except that near Bass creek some of them contain layers of small 

 pebbles of quartz, slate, granite and trap. The whole of these sand- 

 stones underlie those of Blomidon, and resemble those which occupy' 

 the long valley of Cornwallis and the Annapolis river, westward of this 

 section. In this valley, the red sandstone, in consequence of its soft 

 and friable nature, is rarely well exposed, but where observed, it has 

 the same dip as on the coast. The comparatively high level of the 

 sandstone, where it underlies the trap, shows that the present form of 

 this valley is in great part due to denudation. 



Commencing at Truro, the New Red Sandstone extends with several 

 interruptions, as far as Cape d'Or. It consists of a narrow strip ex- 

 tending only about three miles from the bay, with occasional masses 

 of trap. At Cape d'Or a great mass of trap I'ests on slightly in- 

 clined red sandstone, and this again on disturbed carboniferous rocks, 

 while, behind and from beneath these last, still older slates rise into 

 mountain ridges. Cape d'Or forms a great salient mass standing out 

 into the bay, and separated from the old slate hills behind, by a val- 

 ley occupied by the red sandstone and carbojiferous shales. It dif- 

 fers from most of the trappean masses in the arrangement of its com- 

 ponent parts. The upper part of the cliff" consists of amygdaloid and 

 tufa, often of a brownish color, while beneath is a more compact trap, 

 showing a tendency to a columiiar structure. 



The small patches of New Red Sandstone on the New Brunswick side 



of the Bay of Fundy, with the deposits in Nova Scotia, show that the 



depression occupied by the Triassic Bay was of similar form (though 



somewhat enlarged probably) to that occupied by the present Bay of 



Fundy. 



[To BE Continued.] 



Note. — The species discussed in the first part of my paper on North 

 American Limnaeidae, in the last number of this Journal, and of which 

 the name was omitted, is the Bidimnea megasoma, Say. A. G-. W. 



