sandstone formations. In geologic time, 2) a chemical change or maturation took place, and the glassy dust decomposed into the present, thick clay formation. The Porters Creek clay... now.Our project has specifically studied and added that component to the geological knowledge of the overall uranium system.The Porters Creek clay became a source of uranium,most... and penetrated the Porters Creek clay during the lengthy decomposition process.Some of these deep sands and ancient aquifers have been mapped within the project area, but their morphology...