The strata on the Credit river between Meadowvale and the lake show 

 exposures in descending order of the lower part of the Queenston member, the 

 whole of the Meadowvale, Streetsville, Erindale, and Credit members, and 

 the upper part of the Humber member. 



With the exception of the overlying red Queenston shale, the rocks consist 

 largely of greyish shale showing in many places harder beds of impure arenaceous 

 shale and argillaceous sandstones on which ripple marks are frequently seen 

 and even mud cracks at some levels. At intervals, more or less defined, are 

 layers of fossiliferous limestone. All these rocks indicate a deposition near a 

 shoreline as attested by the markings mentioned and by the manner in which 

 the fossiliferous limestone layers rapidly wedge out into unfossiliferous shales 

 and sandstones. 



The following table indicates the detailed subdivisions of the rocks on the 

 Credit river, with an approximate correlation with those of the Ohio valley. 



STRATIGRAPHY AND CORRELATION OF THE CREDIT RIVER ROCKS 1 



PALEONTOLOGY 



Under this heading will be found a complete list of the species occurring 

 on the Credit river, together with notes on important features and the strati- 



J Since this table was printed, a new classification has been published by Dr. Foerste. See 

 Mem. 138, Geol. Surv. Can., 1924. 



