Nomenclature of uppermost Cretaceous and Tertiary stratigraphic units in the Fossil basin ______________ _ 2. Fossils from the lower member of the Wasatch Formation in the Sage quadrangle, Lincoln County, Wyo __ _ 3. Dominant rock types and sequences of Upper Cretaceous and Tertiary stratigraphic units in the Fossil basin and adjoining areas ____________________________________________________________________ _ 4. Approximate ages of the stratigraphic units in the Fossil basin and adjoining areas ______________________ _
Two holes drilled through reef sediments into basalt have established a geologic section through the Miocene. Midway was built above the sea by flows that were weathered and partially truncated in pre-Miocene time. After submergence, volcanic clays were reworked and covered by limestones. Overall ubmergence was interrupted at least twice by emergence. The limestones have been leached, recrystallized, and partially dolomitized.
Aragonitic, unconsolidated sediments from the borings on the Eniwetok and Bikini atolls are isotopically identical with unaltered skeletal fragments, whereas the recrystallized limestones exhibit isotopic variations resulting from alteration in meteoric waters during periods of emergence. Dolomites and associated calcites are enriched in O(18), perhaps because of interaction with hypersaline brines.
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