162 Canadian Record oj Science. 



III. The Windsor Limestones and Gypsums. 



IV. The Hopewell Sandstones, shales and marls, which constitute 



another series of sti'ata which overlie the Union and Rivers- 

 dale formations, and are in turn overlaid iinconformably (?) 

 by the millstone grit and coal measures in certain portions 

 of Pictou County. 

 (An unconformity is supposed to occur here, but I have not 

 detected it. I did not observe any unconformity between the 

 Millstone grit and the underlying strata in the Joggins near 

 Downing's Cove, but a gradual passage of strata from what 

 has been termed (anteriorly) Lower Carboniferous into mill- 

 stone grit and coal measures. ) 



V. The millstone grit formation of Westville, Skinner's Brook, Pictou. 

 County, N.S., and Joggins, etc. 

 (An unconformity occurs here in certain portions of Pictou County, 

 as, for example, on Blackwood Brook, opposite New Glasgow,, 

 where the upturned edges of the millstone grit (Logan) are 

 overlaid by the New Glasgow conglomerates of Fraser's 

 Mountain, etc. ; whereas, in other portions, the millstone grit 

 is directly superimposed by the productive coal measures, 

 Westville and Stellarton, where the Acadia and other seams. 

 are being so extensively developed. ) 



These two geological areas give us two series of sediments- 

 with the following succession to the millstone grit (VI.) : 



A B 



V. Millstone grit. V. Millstone grit. 

 VI. Coal measures. VI. Unconformity. 



VII. New Glasgow conglomerate. 

 VIII. Spirorbis limestone. 



IX. Smelt Brook carbonaceous shales and 



sandstones. 

 X. Pictou sandstones. 



XL Cape John red sandstones and conglom- 

 erates. 



In ascending order, the successive geological formations to which 

 the following provisional names are given, may be thus classified : — (1) 

 the Riversdale formation ; (2) the Union formation ; (3) the Windsor 

 formation ; (4) the Hopewell formation ; (5) the Westville formation 

 (millstone grit) ; (6) Stellarton formation (coal measures of Westville, 

 Stellarton and Thorburn) ; (7) the New Glasgow formation (conglom- 

 erates of New Glasgow, Fraser's Mountain, etc.); (8) Merigomish 

 (Small's Brook) formation (Spirorbis arietina beds) ; (9) Smelt Brook 

 formation; (10) Pictou formation (McKeen's Quarries, etc.); (11) 

 Cape John formation, River John and Cape John. 



