Madison Limestone
...that Madison Limestone, a layer of mostly carbonate rocks formed in the Mississippian period, serves as an aquifer and an oil reservoir in the Rocky Mountains and Great Plains areas?
...that <b id="mwBco"><a class="mw-redirect" href="./Madison_Limestone" id="mwBcs" rel="mw:WikiLink" title="Madison Limestone">Madison Limestone</a></b>, a layer of mostly <a href="./Carbonate" id="mwBcw" rel="mw:WikiLink" title="Carbonate">carbonate</a> rocks formed in the <a class="mw-disambig" href="./Mississippian" id="mwBc0" rel="mw:WikiLink" title="Mississippian">Mississippian</a> <a href="./Geologic_time_scale" id="mwBc4" rel="mw:WikiLink" title="Geologic time scale">period</a>, serves as an <a href="./Aquifer" id="mwBc8" rel="mw:WikiLink" title="Aquifer">aquifer</a> and an <a class="mw-redirect" href="./Oil_reservoir" id="mwBdA" rel="mw:WikiLink" title="Oil reservoir">oil reservoir</a> in the <a href="./Rocky_Mountains" id="mwBdE" rel="mw:WikiLink" title="Rocky Mountains">Rocky Mountains</a> and <a href="./Great_Plains" id="mwBdI" rel="mw:WikiLink" title="Great Plains">Great Plains</a> areas?