Lateral facies associations and vertical Stratigraphic limits of Cu, Pb, Zn, Ag, Hg, U, Ti, Fe, Ba, and Sr occurrences in Mississippian strata of eastern Canada are employed to demonstrate the importance of recognizing favorable paleoclimatic limits in assessing continental-shallow marine sequences for their metallic mineral potential.Six facies-controlled mineral groups are recognized. The mineral occurrences are symmetrically centered on the Windsor marine transgression and regression that invaded the basin during an arid interval in the otherwise prevailingly subequatorial monsoon-type Mississippian climate. No metallic mineral occurrences of significance except Fe and U have been reported from the Horton or Riversdale-Cumberland Groups indicating that paleoclimatic conditions supporting sapropelic lacustrine deposits and/or coal measures and base metal-silver mercury occurrences are mutually exclusive.

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