332 H. C. COOKE 



SUMMARY 



The present paper is a continuation of that published last 

 summer. Data obtained during the summer of 1919 have shown 

 that the sedimentary rocks at Larder Lake, Ontario, are not 

 interstratified with the Keewatin, as formerly supposed, but are 

 parts of a synclinal sedimentary series overlying the Keewatin 

 unconformably. The series forms a lineal continuation of the 

 Timiskaming series of Kirkland Lake, to the east. 



It is shown that the Timiskaming series of Kirkland and Larder 

 Lakes is to be correlated with the Mattagami series of northern 

 Quebec. The name Timiskaming series is applied to both. 



The age of the Timiskaming series is discussed, and the con- 

 clusion drawn that it is pre-Huronian. 



Descriptions as detailed as possible are given of the stratigraphy 

 and thickness of the Timiskaming series, and the mode of origin 

 of the series is discussed. 



As the determination of the age of the Timiskaming is also 

 indicative of the age of the granites which intrude them, a brief 

 consideration is given to the question of the proper nomenclature 

 to be applied to these granites. The conclusion is reached that 

 they may properly be termed Laurentian. 



