J.A.D. Dickson correctly asserts that the accurate characterization of the style and extent of diagenetic alteration of carbonate phases is a critical first step in evaluating the primary composition of ancient carbonates and thence the chemistry of the solution from which the carbonate precipitated. In this context, the extensive prior work on the depositional and diagenetic history of Muleshoe Mound and the Lake Valley Fm. provided the ideal setting to extend our studies to evaluate the elemental composition of these same carbonates, with a specific focus of estimating primary Mg contents. Such studies of elemental composition, including the seminal works...

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