1st Research Conference - Gulf Coast Section SEPM
1st Research Conference - Gulf Coast Section SEPM
1st Research Conference - Gulf Coast Section SEPM
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Local highs on aeroradioactivity maps coincide with outcropping Tuscaloosa<br />
sediments. Field measurements indicate that both reduced and oxidized<br />
floodplain clays produce 13-18 µR/hr, and channel bar sands produce a wider<br />
range of values (10-20 µR/hr), depending largely on sediment sorting and<br />
heavy mineral content. Preliminary chemical studies and spectrometry suggest<br />
that gamma radiation in the clays results from concentrations of both uranium<br />
and potassium, whereas thorium accounts for significant gamma radiation in<br />
certain sand intervals.<br />
The geographically extensive fluvial facies represented by the Tuscaloosa in the<br />
eastern <strong>Gulf</strong> <strong>Coast</strong>al Plain suggest considerable relief and probable uplift in the<br />
southeastern United States during the Cenomanian, a time of worldwide<br />
marine transgression. The formation of an extensive coastal plain during this<br />
period profoundly affected the composition and supply of sediment along the<br />
margin of this basin for the balance of the Cretaceous.