72 THE GLACIAL LAKE AGASSIZ. 



quanies, which are about 800 feet above the sea, and thence it holds 

 nearly this height westward. The limestone, shown to a depth of about 

 10 feet, is apparently the same as that forming the upper pax-t of Stony 

 Mountain. It lies in beds mostly 1 to 2 feet thick, horizontal, or in part 

 dipping 1 to 2 degrees to the south-southwest. 



Stonewall. — At Stonewall, 5 miles northwest of Stony Mountain, a hard 

 and cherty limestone has been extensively quarried, exposing a vertical 

 section of 17 feet. The upper layers of this rock to a thickness of 7 or 8 

 feet are white and fossiliferous, but it gradually changes below to a red 

 stratum which has no fossils. 



From his study of the fossils collected in these outcrops on the Red 

 River and westward, Mr. Panton concludes that their ascending strati- 

 graphic order is the same as their geographic order from east to west, and 

 wi'ites of the series as follows: 



The Selkirk rock lia.s a most comprelieusive group of fossils, there being repre- 

 sentatives of several beds, but taking them as a whole the Trenton fossils are best 

 represented. The rocks at Lower Fort Garry seem to indicate a transition bed 

 between those of East Selkirk and the lower layer at Stony Mountain. They contain 

 forms common to both: The fossils of the lower layers at Stony Mountain bear a 

 marked resemblance to those found in the Hudson Eiver group elsewhere, while 

 the higher dolomitic beds and those of Stonewall probably border on the Niagara 

 formation.' 



UPPER SILURIAN AND DEVONIAN FORMATIONS. 



West of these Lower Silurian strata, rocks of Devonian age, mostly 

 pale-gray or buff magnesian limestones, occur on Lakes Manitoba and 

 Winnipegosis, as reported in 1884 by Dr. Gr. M. Dawson; "and it is 

 probable," he wrote, "that the intervening formations will be found to be 

 extensively developed in the Lake Winnipeg region as it is more fully 

 examined."^ 



Subsequent exploration of this region by Mr. J. B. Tyrrell has resulted 

 in the discovery of Upper Silurian strata, containing fossils characteristic 



"'Gleanings from outcrops of Silurian strata iu the Red River Valley." Transactions of the 

 Historical and Scientific Society of Manitoba, November 27, 1884.. 



^Descriptive Sketch of the Physical Geography and Geology of Canada, p. 37. 



