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Carbon Isotope Chemostratigraphic Correlation of the Noonday Formation

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  • The Marinoan Snowball Earth ended 635 Ma ago during the Neoproterozoic Era, after an interval in which the Earth was completely covered by glaciers. Thawing of these glaciers formed cap carbonates across shallow marine depositional environments. The Noonday Formation is a cap carbonate that formed after the deglaciation of the Neoproterozoic snowball Earth and is found in outcrops in the Death Valley region in Southeastern California. The Noonday Formation is separated into a basin and platform environment, which present a challenge of correlating units between sections due to variability in lithologies. Stable carbon isotope correlation, as well as sequence stratigraphy, is able to help determine where the Saddle Peak Hills carbonate fits into the Winter’s Pass stratigraphic record. The data indicate that the Saddle Peak Hill’s carbonate unit correlates to a time of sandstone deposition on the platform, suggesting the platform was in a beach environment when the basin was in a shallow marine environment.
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