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Abstract

The deposits briefly discussed fall mainly within the Lower Phanerozoic and are typical of the period from the Devonian to the Cretaceous. This is thought to be due to a form of evolutionary progression affecting both the crust and the biosphere. A consequence of this is that features which tend to be common and characteristic of these deposits are absent or of less importance in other strata-bound lead-zinc deposits belonging to different epochs. Among the features which are held to be of importance are: coastal deposition under transgressive conditions; active tectonic movement during deposition; fumarole and volcanic associations; calcareous and dolomitic sedimentation. Most instances show important later modifications which occurred during the processes of diagenesis or still later if the strata were subjected to the phenomena which accompany the geomorphology that goes with karst landscapes.

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