1867.] IIARTT — ON CARBONIFEROUS LIMESTONES. 221 



confined to this bed. Lamellibranchs are abundant, and among 

 the most characteristic may be named the following : — 



Avicuhpecten reticulata, Daws., Windsor and Gay's River; 

 A. Nova-Scot lea Daws., (.4. plicata of Acadian Geology); 

 Macrodon Hardingii Daws., very characteristic; Conocardium 

 Acadicum, nob., rare. The Gasteropods are all minute and as 

 yet undetermined. A Conularia is occasionally met with at 

 Windsor and Stewiacke. 



Of the Cephalopods, we have a large Nautiloid shell, Nautilus 

 (Cryptoceras) Avonensis Daws., not uncommon at Windsor and 

 Stewiacke; a Trematodiscus (?), and also two or more species of 

 Orthoceras. I cannot report a single fragment of a vertebrate for 

 the Stewiacke limestone. * 



The question naturally arises as to the relative position of these 

 beds, but this is one which it seems impossible to settle from the 

 Windsor section, and I have seen no localities elsewhere, where 

 their relations to one another were distinctly exhibited. I think 

 that there can be no doubt that the Stewiacke limestone is the 

 highest, the Windsor limestone coming next below, the Kennetcook 

 limestone appears to come next in order, and the oolitic fossiliferous 

 band, to which I give no name, underlies this again, but the Avon 

 limestone at Windsor, is separated from the rest by a fault, and 

 although I believe it to be the lowest of the four limestones, it may 

 be that subsequent observations made elsewhere, may not confirm 

 that belief. These carboniferous limestones whenever they occur, are 

 much disturbed and broken up, while the disintegration of the 

 intercalated soft marly strata and gypsum beds, adds to the 

 obscurity of the exposures. 



The resemblance borne by the faunae of the Acadian carbon- 

 iferous limestone to the permian of Europe, has been ably discussed 

 by Lyell, Dawson and Davidson ; but these gentlemen have united 

 in expressing the opinion that they are really members of the 

 carboniferous system. In studying the Windsor fossils at the 

 Museum of Comparative Zoology, I failed to find any marked 

 resemblance between them and those of the sub-carboniferous of 

 the West, while I was exceedingly struck with the greater 

 similarity borne by these in their fades to the fauna of the Kansas 

 permo-carboniferous ; and in a list of New Brunswick fossils, which 

 I contributed to Professor Bailey's Report on the Geology of the 



* The whole of the fossils referred to in this paper, will be described 

 in the forthcoming edition of Dr. Dawson's Acadian Geology. — Eds. 



