My Aquifer > Groundwater Basics > What does an aquifer look like?
Figure 5 shows an example of an aquifer system in the lower Portneuf River valley. The diagram represents a cut-away perspective view of this system of multiple aquifers and is greatly exaggerated in its vertical scale to show some of the details. Several different aquifers occur in this valley. In the northern valley (beneath Chubbuck and north Pocatello) multiple confined aquifersare stacked on top of one another and separated by aquitards made of clay; the aquifers tapped by Chubbuck's municipal wells are in the fractured basalts of the eastern Snake River Plain. In the southern valley (Portneuf Gap to Red Hill) the upper surface of the unconfined aquifer is the water table.