They may safely be considered to be among the oldest auriferous sediments of the world. [Please select]
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Ancient igneous rocks such as granite lie intricately mingled with old and highly metamorphosed sediments. [Please select]
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They took root in the slimy sediments which had been carried down from the tops of the hills and they became plants. [Please select]
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Sediments underlying northwestern South Dakota include rocks assignable to the Pierre (shale), Fox Hills (sand), and Hell Creek formations of Cretaceous age and the Ludlow and Tongue River formations of the Paleocene. [Please select]
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