114 Canadian Record of Science. 



emphasis upon certain processes of formation of sedi- 

 mentary deposits which, though apparently departures 

 from the normal method of formation, have apparently 

 been the dominant processes in the growth of our greater 

 sedimentary formations. The problem of the formation 

 of sedimentary deposits (chiefly aqueous), is considered 

 from a deductive standpoint, but it is based upon studies, 

 more or less defective as to detail, of present geologic 

 processes as they are in progress in our Great Lakes and 

 elsewhere. First assuming certain elementary conditions 

 of general occurrence in the formation of sedimentary 

 deposits, the effects of variation in either of these factors, 

 singly, or in both simultaneously, are considered. Later, 

 secondary factors — since they are less important or are 

 less widespread in their operation- — are introduced, and a 

 very few of the many complications which they would 

 produce in the nature of the resulting deposits are con- 

 sidered. Naturally it will be found that the increase in 

 the number of variant factors results in an increased com- 

 plexity of product, and it is under the operation of these 

 complex conditions that similar results may be produced 

 by processes which are not exact equivalents. 



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At the present time it is generally conceded that all 

 the great sedimentary formations were laid down around 

 the margins of great ocean bodies and upon a gradually 

 sinking land surface. In the generally accepted hypothesis 

 of the formation of sedimentary deposits along the margin 

 of a slowly sinking land area what may be termed the 

 normal distribution of material, supplied by the waste of 

 that land area and by which the sedimentary formations 

 are built up, will be the formation of arenacious deposits 



