Stratigraphy of the Cambro-Silurian Rocks of E. Manitoba. 7 1 



The exposures at the latter places have been frequently described and 

 the building stone from these quarries has been largely used in con- 

 structions in Winnipeg, they are therefore well known. The principal 

 difference between these beds and those of the lower mottled limestone 

 consists in the very white nature of the lighter portions, as also the 

 general soft or chalky texture of the uncrystalline particles scattered 

 throughout the whole mass leaving chalk or lime marks on the hands 

 after handling. The mottling is ot a light brown and is in irregular 

 patches, but so general as to affect the whole of the beds giving them 

 a general yellowish tint. It dresses easily and makes very fine building 

 and ornamental stone. The papers by Prof. Panton* and Mr. Mc- 

 Charles* give graphic and full details regarding this stone. As to the 

 thickness of the formation here, we were at first obliged to depend on 

 a calculation based on the known dip of the beds at Grindstone Point 

 of about 50 feet in six miles assuming, however, that this dip is 

 approximately the same at the south, the thickness of the limestone 

 below Selkirk would be the total dip given in about 30 miles or 250 

 feet. Since the field work was finished a well has been drilled for the 

 fish hatchery at Selkirk West and the bottom of the limestone passed 

 through was found at 262 feet. Deducting then the thickness of the 

 lower beds seen on Lake Winnipeg leaves about rio leet of the upper 

 mottled rock of Selkirk. To this may be added about 20 feet for beds 

 between Selkirk and Winnipeg of the transition type as at Clark's Point. 

 There is a strong probability that the beds at East Selkirk and Lower 

 Fort Garry are brought up by a small fault running easr and west very 

 near the northern limits of the former.t The amount of the upthrow 

 is very uncertain and we can assume that the main part of these expos- 

 ures are to be added to the thickness given in the drilling. I would 

 not hesitate therefore in calling the thickness of these beds down to the 

 recognized yellow beds of the Cat Head type, at least 150 feet, making 

 a total of 290 feet of the limestone series. To the north the upper 



Transactions No. 15, 20 ami 27, Man. Historical and Scientific Society, Win- 

 n 'P e S- 



tThe foot -steps of time in the Red River Valley by A. McCharles, Transactions 

 No. 27, Man. Historical and Scientific Society. 



