294 THE STRUCTURE AND SUCCESSION AT 



kettle holes, while others may be due to an unequal distribution 

 of drift, creating new lines of drainage or diverting old ones. 

 References. — The following papers and books have been 

 used in preparing this paper: — * 



Brown, Richard. 



'71. The coal fields of Cape Breton. 

 Dawson, Sir J. W. 



'78. Acadian Geology, 3rd ed. 

 Fletcher, Hugh. 



:00. The Sydney coal fields [pamphlet, Geol. Surv. 

 Can., accompanying three revised geological 

 sheets.] 



Gilpin, Edwin, Jr. 



'86. Cape Breton Carboniferous. ISTov. Scot. Inst. 



Nat. Sci., proc. and trans., vi, pp. 289-298. 

 '88. Ditto, vii, pp. 24-25, 100-117. 

 '89. Ditto vii, pp. 214-226. 



Robb, Charles. 



'74. Report on explorations and surveys in Cape 

 Breton, IsFova Scotia. Geol. Surv. Can., rep. for 

 1873-74, pp. 171-188. 



'76. Ditto, rep. for 1874-75, pp. 166-266. 



Part 1, Descriptive Geology. 



limestone series. 



Classes of rocks. — The study resulting in the present paper 

 ended on the west arbitrarily at the railroad track, from the 

 necessity of establishing an end somewhere. Thus the whole of 

 the limestone series did not come into the field. The strata ob- 

 served, however, can be conveniently grouped into three classes : 

 — (1) a very calcareous shale; (2) a much less calcareous sand- 

 stone; (3) beds of marl and impure limestone, containing large 



