

williams.] HARTLEY. 241 



rocks, the authors gave a detailed account of the Siluro-Devonian 

 formation occurring on each side of the granite ridges to the south of 

 the Carboniferous. These sediments they divide into a lower and upper 

 division, each of which is subdivided into two series. These occur 

 chiefly in St. John, Charlotte, and Queen Counties. A gradual passage 

 from the granites to undoubted Siluro-Devonian rocks is well exhib- 

 ited in the Nerepis Valley and on the eastern shore of the St. Avise 

 Eiver, Charlotte County. A similar series occurs in Perry, Maine. 

 The granitic rocks at the base are not considered as Siluro-Devonian. 



The lower division consists of two series: First, limestones, felsites, 

 etc.; second, gray sandstones, black slates, and Dadoxylon sandstones. 

 These are followed by a series known as the "Mispec rock," consisting 

 of diorites, conglomerates, and slates, which are followed by the green 

 "Cordaite" slates. 



The authors state that further investigations indicate that the Nere- 

 pis granites, formerly considered as Devonian, must be regarded as of 

 Upper Silurian age, if not older. 



Mr. Edward Hartley made a report 1 of a part of the Pictou coal field 

 in the year 1870. The region reported upon lies " between the East and 

 West Eivers of Pictou, and extends laterally from Conglomerate ridge, 

 a prolongation of Fraser's Mountain, on the north of New Glasgow, to 

 the Fox-brook Road, between the coal mines and Hopewell Village." 

 The rocks are described under the following divisions : 



1. Pre-Carboiiiferous. 



2. Millstone grit. 



3. New Glasgow Conglomerate. 



4. Productive Coal Measures. 



The rocks here called " pre-Carboniferous " were observed by Mr. 

 Dawson, and in his " Acadian Geology " are said to be " probably of 

 Devonian age." They consist of metamorphic rocks, mainly siliceous 

 slates and conglomerates, and in one locality, Waters' Quarry, a lime- 

 stone of 20 feet thickness. Comparing his section with the classifica- 

 tion of the Carboniferous published iu Dawson's Acadian Geology, viz, 

 "(5) Lower Coal Measures, (4) Carboniferous limestone, (3) Millstone 

 grit series, (2) Middle Coal formation, (1) Upper Coal formation," the 

 author considered all but the (3) "Millstone grit series" aud the (2) 

 "Middle Coal formation" to be wanting; and in some places he found 

 the Devonian rocks followed by the Middle Coal formation without even 

 the Millsone grit. 



The section at McLeod's Brook 2 represents 3,773 feet of sandstones 

 and conglomerates ; on East Eiver, above Albion mine, 1,402 feet of 

 sandstones; both of these are referred to the Millstone grit. Impure 

 limestone beds are seen in the lower part of the formation in the East 



1 Hartley, Edward: Report on a part of the Pictou coal field. Geol. Survey Canada; Report of 

 Progress for 1866-1869, 1870, pp. 55-107. 

 'Ibid., p. 60. 



Bull. 80 16 



