219 



gical structure of the region in general is admittedly 

 intricate, and exposures at critical points are usually 

 imperfect. 



In view of the above stated lines of criticism it must 

 be emphasized that, whatever results future study of the 

 facts in the field may yield, in the opinion of all who have 

 used Fletcher's maps, the boundaries laid down on them 

 by him will be found to accurately indicate the limits of 

 structural or stratigraphical units even though, eventually, 

 it may be proven that errors of classification and correla- 

 tion exist. 



Of the geologists who have held opinions contrary to 

 those advocated by Fletcher, nearly all have based their 

 arguments solely on palseontological grounds. Dawson 

 from the first held that the strata in question are of Carbon- 

 iferous age and so described and mapped them in the first 

 edition of Acadian Geology published in 1858. The 

 following fossils have been determined by Dawson [4; 3, 

 p. 29] as occurring in the strata of the type section along 

 the Intercolonial railway. Possibly the list as given is 

 incomplete, since Dawson did not always record localities 

 from which fossils were obtained. 



Anthracomya(Naiadites) elongata. Lepidophloios acadianus. 

 A. Isevis. Odontopteris antiqua. 



Calamites cistii. Cardiopteris, — 



C. cannseformis. Pectopteris abbreviata. 



Hymenophyllites furcatus. 



From the character of the fossils, Dawson considered the 

 containing strata to be of Millstone Grit age. 



In 1897 and succeeding years, H. M. Ami visited many 

 localities within the so-called Devonian area and made 

 extensive collections of fossils. Representative collections 

 were sent to Robert Kidston, David White, T. Rupert 

 Jones and Henry Woodward, all of whom as pointed out Ami 

 [1; 2] and Whiteaves [9], united in agreeing that the fossils 

 indicated that the strata are of Carboniferous age while 

 Kidston and White agreed that the horizon was well up in 

 the Carboniferous. White [8] in a later paper has directly 

 presented his conclusions and has shown that Kidston and 

 he are in essential agreement in placing the horizon of the 

 strata at or about that of the Millstone Grit. 



Ami in one of his papers [2, pp. 168-9], has assembled the 

 determinations of the various palaeontologists and the 



