. Bulletin of the Geological Society of America. Geology. 558 PKE-WISCOXSIX GLACIAL DRIFT IX MONTANA section on Belly Eiver within the terminal moraine of the Keewatin ice- sheet showing in order, beginning at the bottom: "A Till formed by Belly River Glacier containing many boulders, all of which are smoothed and striated to an unusual degree. 75 feet; B, Soil, of which only a small exposure was seen, which contained no fossils; C, Till formed by the Keewatin ice-sheet. SO ; He did not, however, regard the soil (B) as indicating any considerable lapse of time between the deposi
. Bulletin of the Geological Society of America. Geology. 558 PKE-WISCOXSIX GLACIAL DRIFT IX MONTANA section on Belly Eiver within the terminal moraine of the Keewatin ice- sheet showing in order, beginning at the bottom: "A Till formed by Belly River Glacier containing many boulders, all of which are smoothed and striated to an unusual degree. 75 feet; B, Soil, of which only a small exposure was seen, which contained no fossils; C, Till formed by the Keewatin ice-sheet. SO ; He did not, however, regard the soil (B) as indicating any considerable lapse of time between the deposition of the mountain drift (A) and the overlying drift of the Keewatin ice-sheet (C). Xo such intervening bed as the soil (B) was observed by the present writers in any of the expo- sures where they saw mountain drift overlain by drift from the Keewatin ice. Eelatioxs of the "Saskatchewan" Gravel The relations of the "quartzite gravels" which have been included under the name "Saskatchewan*" will now be Figure 8.—Section on Saint Mary River 1 Mile South of Kimball, Alberta A, quartzite gravel ("Saskatchewan"!, interglacial (?), 0 to 15 feet, overlying, sand- stone ; B, Wisconsin till of Keewatin glacier. 50 to 100 feet: C, loess-like clay, 10 feet; D, gravel overlain by a few feet of soil. We observed on Belly Eiver, in the vicinity of Lethbridge, 10 to 15 feet of "quartzite grave?' overlying the Cretaceous beds and underlving the lower boulder-clay (figure ?. A). Forty miles farther south in Saint Mary Valley, about 1 mile above Kimball (figure 8), 0 to 15 feet of similar quartzite gravel is overlain by 50 to 100 feet of till from the Keewatin ice-sheet, which apparently composes a single drift sheet and which we are inclined to regard as the upper boulder-clay. The bed of gravel pinches out midway in the length of this exposure against the ris- ing surface of the underlying upturned and eroded sandstone, as though de
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