Examples of aquifers - Physical Geology lecture notes

Above is photograph of the Niobrara River valley wall in the Fort Niobrara area. The blue arrows point to a water seep horizon. The Rosebud Formation sediments below are rich in volcanic ash and clays and so are relatively impereable. Overlying them are sands and gravels of the Ogalalla Group which are the major unconfined aquifer in Nebraska, and extends down into Texas. Thus, here the water seep represents a perched aquifer intersecting the landscape. Note that in this case the Niobrara is partly groundwater fed as some of the seeps reach water level.

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