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Phosphorite nodules recovered from the upper west Florida slope provide an analog for phosphogenesis under conditions of marginal upwelling that are significantly different from the regional, continental shelf-upwelling models applied to the majority of the southeastern United States. We believe that ferruginous (AI and All) and nonferruginous (BI and BII) phosphorite nodules record the episodic precipitation of francolite since the mid-Miocene (12–15 Ma) in response to positioning of the Gulf of Mexico Loop Current. It is likely that during sea level highstands, deflection of the Loop Current landward increases the C flux, establishing conditions suitable to the concentration of...

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