328 H. C. COOKE 



observed in the conglomerates and interbedded greywackes. The 

 change in the character of the sediments, from a series of inter- 

 bedded conglomerate and greywacke on the west to a series on the 

 east in which conglomerate is a relatively minor part, might indicate 

 that the territory to the west which supplied the sediments was 

 higher and more rugged, with more rapid streams, than that which 

 supplied the sediments to the east. This conclusion is strengthened 

 by the fact that the material composing the upper conglomerates 

 in Teck Township is noticeably more angular than that to the east, 

 so much so in fact that many of the conglomerates resemble breccias. 

 We may infer therefore a large lake or, on account of the 

 thickness of the series, more probably a transgression of the sea 

 due to gradual submergence. To the west of what is now Teck 

 Township there must have been a fairly rugged mountainous or 

 semi-mountainous area, flattening to the east. Vegetation was 

 entirely lacking or almost so. As the sea advanced, a normal thin 

 basal conglomerate was first formed, composed of fairly well- 

 rounded fragments of the underlying rocks. This was supple- 

 mented by sharp-angled material brought down by streams, in 

 large amount in the west, in lesser amount in the east. As sub- 

 mergence continued, the deposition of conglomerate ceased alto- 

 gether in the east to be replaced by that of greywackes and finally 

 argillites, with small amounts of arenaceous materials locally. 

 Submergence apparently was never great enough to cover the 

 mountainous area to the west; or, if so, with it disappeared the 

 last source of sedimentary material in important amount; since 

 the conglomerates and greywackes of Teck are not overlain by 

 finer-grained beds. 



NOMENCLATURE 



A brief discussion of the nomenclature of the granite of 

 Timiskaming district may be added here, as closely related to the 

 main purpose of this paper. The term Algoman has recently been 

 applied by Miller, Burrows, and others, when referring to granites 

 intrusive into the Timiskaming series but underlying the Cobalt 

 series.^ The term Algoman was first used in the Rainy Lake 

 district by A. C. Lawson, and was defined by him as applying to 



' Ont. Bur. Mines, Rept. No. 22, Part 2, pp. 123-27, 1913. 



