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Reference.org
Smackover Formation
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<p>The Smackover Formation is a <a href="/facts/Formation_(geology)/mMhpw4G2">geologic formation</a> that extends under parts of <a href="/facts/Arkansas/Qun124UP">Arkansas</a>, <a href="/facts/Louisiana/2GvfFcKE">Louisiana</a>, <a href="/facts/Texas/B987WHF0">Texas</a>, <a href="/facts/Alabama/1Xk8EveN">Alabama</a>, <a href="/facts/Mississippi/7KwuWxxT">Mississippi</a>, and <a href="/facts/Florida/cF245A3Q">Florida</a>. It preserves <a href="/facts/Fossils/by7NzIA1">fossils</a> dating back to the <a href="/facts/Jurassic/o5Cy4KzX">Jurassic</a> <a href="/facts/Period_(geology)/6LBR11yQ">period</a>. The formation is a relic of an ancient sea that left an extensive, porous, and permeable limestone geologic unit. </p><p>The Smackover Formation consists of <a href="/facts/Oolitic_limestone/2GNzb4AJ">oolitic limestones</a> and <a href="/facts/Silty/HAxJkhDP">silty</a> <a href="/facts/Limestone/8ntvtFnR">limestones</a>. </p>