46 



STRATIGRAPHY AND CORRELATION OF THE CREDIT RIVER ROCKS 



Attitude of the Strata. — It has been known for years that the Paleozoic 

 rocks of Ontario dip in a general southwesterly direction, and various estimates 

 have been made as to the angle of dip. Very recently, Colonel Harkness, 

 Commissioner of Gas, Ontario, has gathered together much information with 

 regard to this matter, based chiefly on records of well-boring, and has made a 

 contour map of the top of the Trenton limestone in Ontario. According to 

 this map, the dip in the vicinity of Streetsville was determined to be about 

 20 feet to the mile and in a direction a few degrees west of south. 



There are two beds in the Richmond which can be recognized at localities 

 some distance apart, both by their lithological character and by their fossils. One 

 of these beds is the bryozoan reef of the Erindale member, which has been 

 recognized on Mullet creek and on Cooksville creek, just north of stop No. 35, 

 Toronto Suburban Railway, three and a quarter miles northeast of Mullet 

 creek. Another bed is the limestone layer, eight feet above the reef, recognized 

 not only by the numerous specimens of Strophomena planumbona erindalensis 

 and Strophomena varsensis contained in it, but also by the fact that it is the 

 uppermost layer of limestone in the Strophomena varsensis zone. This stratum 

 was seen at Mullet creek and five feet above the water level at the outcrop on 

 the west side of the river, northeast of the home of William Crozier (Section 

 No.: 10). 



