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An aquifer is defined as a geologic formation that is sufficiently water-saturated and permeable to yield a significant quantity of water to wells or springs. The aquifer systems of the Pathfinder to Guernsey Dam subbasin are shown on the map below. Aquifer systems currently used and/or available for future development within the Pathfinder to Guernsey subbasin include the following:
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Quaternary Aquifer System (Alluvial deposits);
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Quaternary Aquifer System (Non-alluvial deposits);
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Late Tertiary Aquifer System ( White River and Arikaree Formations);
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Early Tertiary Aquifer System (Wasatch and Fort Union Formations);
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Late Cretaceous Aquifer System (Lance Formation, Fox Hills Sandstone, Mesaverde Formation, and Frontier Formation);
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Early Cretaceous Aquifer System (Muddy Sandstone and Cloverly Formation);
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Triassic-Jurassic Aquifer System (Sundance Formation);
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Late Paleozoic Aquifer System ( Casper Formation, Tensleep Sandstone, Hartville Formation, and Madison Limestone);
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Early Paleozoic Aquifer System (Bighorn Dolomite and Flathead Sandstone); and
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Precambrian Aquifer System (Precambrian crystalline bedrock units).
The Quaternary, Late Tertiary, Early Tertiary, Late Cretaceous, and Late Paleozoic Aquifer Systems are the most extensively developed aquifer systems within the Pathfinder to Guernsey subbasin.
Click on map to enlarge image, view legend, and to print.
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