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A subsurface correlation of the Colorado shale extending from the Sweetgrass arch area of Montana northward to Bow River is attempted. Graphic sections are given. The Colorado shale of northern Montana continues with little change as far north as Bow Island, but farther north the top of the formation is indefinite because of the lensing-out of the overlying Milk River sandstone. The Medicine Hat gas horizon, which has previously been correlated with the Milk River sandstone, is believed to be a sand in the upper Colorado shale. The Blackleaf member of Montana can be recognized in Alberta. It contains the prominent sandstone horizon which yields gas at Bow Island and Foremost.
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