Groundwater Inventory, Carbon County, Montana 1969
Groundwater Inventory, Carbon County, Montana 1969
Montana Water Resources Board.Groundwater Division
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Differences in terminology are evident, and reported thicknesses may vary significantly depend- ing on the origin of the report (see Table 4). Differ- ences in terminology are carried through the Cloverly and into Jurassic units to the top of the Gypsum Spring formation. Morrison Fowiatton (Jurassic) is light-colored clay and shale and yellow sandstone, with tints of green, red, and purple. Pre-C loverly erosion has removed much or all of the Morrison locally. The Morrison thickness, where repo...rted, varies from 100 to 400 feet. The Morrison is not considered a reliable aqui- fer (one that can be depended upon to yield some water everywhere) although soft sandstones locally may be water-bearing. Sundance Formation (Jurassic) is 100 to 200 feet of brown sandy clay and sandstone, equivalent to the Swift formation of northern Montana. The type Sun- dance section of Wyoming includes tlie Rierdon for- mation described separately in this report. Rierdon Formation (Jurassic) consists of 40 to 250 feet of dense grey and olive-drab limey clay and lime- stone, and is not normally an aquifer.
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