2 Canadian Record of Science. 



and comprises the western portion of the townships of 

 Monmouth and Dudley, and nearly the whole of Gla- 

 morgan and Dysart ; it thus occupies the centre of the 

 southern half of Haliburton county, and is about 75 miles 

 north of Lake Ontario. 1 



So much has recently been written concerning the 

 Laurentian System in Canada, among others by Dr. Frank 

 D. Adams, 2 Professor of Geology in McG-ill University, 

 that only a brief summary need be given here. 



The present view is that the Laurentian consists of an 

 underlying series of gneisses and granites called the 

 Fundamental Gneiss, much of which may be, and probably 

 is, of igneous origin ; and an overlying series, composed 

 largely of gneisses of undoubtedly sedimentary origin, 

 often differing in petrographical character from those 

 underneath, associated with crystalline limestones and 

 quartzites, and known as the Grenville series. 



The geology of this general portion of the Archaean 

 nucleus has been variously described, 3 but the particular 

 area here being considered, as well as all that now 

 included in sheet 118, had received extremely little atten- 

 tion, and in 1894 it was said to be, from a geological 

 point of view, almost a terra incognita} Since that time, 



1. I am indebted to Dr. Adams for all the facts concerning the geology of this area 

 which are set forth in the present paper, also for the specimens which are here des- 

 cribed and for advice and assistance in carrying out the work. The accompanying 

 sketch map is reduced from his large scale field maps. 



A detailed description of the whole district by Dr. Adams and Dr. Barlow will 

 appear shortly in the form of a Report to the Director of the Geological Survey of 

 Canada. 



2. " On the Typical Laurentian Area of Canada," Jour. Geol., 1S93, Vol. I., No. 4. 



" Ueber das Norian oder Ober-Laurentian von Canada," Xeues Jahrbuch fiir 

 Mineralogie, etc., 1S93, Beilage Band VIII. 



" A Further Contribution to our Knowledge of the Laurentian," Am. Jour, sci., 

 1895., Vol. XIJX. 



" The Geology of a Portion of the Laurentian Area," Geol. Surv. Can., Ann. Rep't., 

 1S96, Vol. VIII., Part J. 



3. Murray, A., Geol. Surv. Can., Rep't. of Progress, 1S52-53. 

 MacFarlane, T., ibid., 1S63-66. 



Vennor, H. G., ibid., 1S66-1S69. 

 Vennor, H. G. ibid., 1SV0-77. 



4. Adams, F. D., Geol. Surv. Can., Ann. Rep't, 1891-92-93, Vol. VI., Part J., p. 3. 



