. Bulletin of the Geological Society of America. Geology. 530 PRE-WISCONSIN GLACIAL DRIFT IN MONTANA the high flat-topped ridges of Cretaceous rocks east of the Eocky Moun- tain front in the region of Glacier Park, Montana, are capped with deposits of glacial drift which, because of its topographic relations and surficial modification by weathering, was regarded as much older than the drift in the intervening valleys. The valley drift was deposited by the mountain glaciers at the time of their last extension, which is re-. Scale Figure 1.—Map of Portions of southern Alberta and northern Montan
. Bulletin of the Geological Society of America. Geology. 530 PRE-WISCONSIN GLACIAL DRIFT IN MONTANA the high flat-topped ridges of Cretaceous rocks east of the Eocky Moun- tain front in the region of Glacier Park, Montana, are capped with deposits of glacial drift which, because of its topographic relations and surficial modification by weathering, was regarded as much older than the drift in the intervening valleys. The valley drift was deposited by the mountain glaciers at the time of their last extension, which is re-. Scale Figure 1.—Map of Portions of southern Alberta and northern Montana garded as having been practically coincident with the Wisconsin stage of continental glaciation. At that time, in 1911, the extension of the high-level drift eastward from the mountain front and its relations to the quartzite gravels, described by Calhoun, Dawson, and McConnell, as found to the eastward, had not been fully determined, neither was it known what was the relation of this pre-Wisconsin drift to the "Albertan" drift of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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