38 THE ROYAL SOCIETY OF CANADA 



the same beds for Morden and the Assiniboine river gives a strike of 

 N.45°W. and a dip of 9.45 feet per mile. The larger base from Morden 

 to Gilbert Plains and the Deloraine Well gives an average of strike 

 N.42°W. and a dip of 9.3 feet per mile. For the projected section 

 from the Pembina escarpment to the Turtle Mountain the plane 

 assumed strikes N.41°W. and dips 9.27 feet per mile. For comparison 

 with this a well at Fleming, 150 miles to the northwest of Deloraine, 

 was also used, and the projection of the top of the Niobrara formation 

 which was ascertained in the records was found to agree closely with 

 the former determination which tends to reduce the errors of possible 

 warping in the beds. 



On a plane passing through Deloraine on the dip ascertained 

 the sections determined at the Pembina outcrop were projected as 

 well as the divisions already determined by J. B. TyrrelP for the 

 Deloraine well. A projection on a parallel plane passing through 

 Taylorton in the Estevan area is incorporated in the general section, 

 and with it the reports of several wells in the vicinity of the line of 

 section are utilized to place finds of coal in the upper parts of the section 

 between Taylorton and Deloraine. A measure of the thickness of the 

 Pierre beds beneath Taylorton is adopted from the boring at Ralph, 

 sixty miles northwest of Taylorton, and this seems to indicate that 

 the general dip adopted for the Manitoba part of the section contin- 

 ues, although it is known that to the north there is a slight rise in an 

 east- west anticline passing through the vicinity of Weyburn. This is 

 determined by the finding of coal seams, apparently those beneath 

 the Estevan and Taylorton seams at several places to the north. 

 The dip as ascertained assuming the coal seam to be the upper of the 

 two deep seams is from Areola normal to the line of section 7.1 feet per 

 mile south eastward, from Stoughton in the same direction 8.6 feet per 

 mile and from Ralph to Taylorton 11.5 feet per mile. As these dips 

 are given in order from east to west, there is a gradual steepening of 

 the southeast dip in the approach to the Estevan field. This change 

 of dip and strike is reflected in the outline, that has long been given 

 to the outcrop of the Tertiary in this area, and is probably local as 

 the southeastern extension in Dakota follows the general trend of 

 the strike assumed for the plane. 



The Section 

 In the Pembina escarpment, the Niobrara rocks are reported by 

 Mr. McLean to be represented by three subdivisions; at the top the 

 Boyne beds, 138 feet; overlying the Morden beds, 250 feet; and at 



1 Three Deep Wells in Manitoba, Trans. Royal Soc, 1891, p. 93, Pt. IV. 



