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DELINEATION OF THE J-1 UNCONFORMITY USING BULK CHEMISTRY ANALYSIS IN SOUTH CENTRAL UTAH; AN AID IN SEQUENCE STRATIGRAPHIC INTERPRETATION

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Abstract

The Temple Cap Formation and Page Sandstone are stratigraphically positioned above the Jurassic-1 (J-1) unconformity in south-central Utah. Radiometric ages have recently demonstrated that these formations are, in part, time equivalent. To conform to these new dates, a new sequence stratigraphic interpretation is necessary. This interpretation cannot be completed without a firm understanding of the location and character of the J-1. I will use a portable XRF to test the hypothesis that the subtle (sand on sand) J-1 unconformity can be characterized regionally. Previous sequence stratigraphic interpretations of these formations have relied heavily on the use of super bounding surfaces as a means of interpretation. It may be that super bounding surfaces are not reliable for a sequence stratigraphic interpretation of an eolian accumulation or that they have been misinterpreted.

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