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1. Paleozoic Blue Schist

   Linked via "Appalachian-Caledonian System"

   Geologic Occurrence and Distribution
   PBS is most famously documented along the suture zones of ancient orogenies, including the Caledonian Orogeny and the Appalachian-Caledonian System. In the North Atlantic Craton (NAC), PBS strata often form narrow, discontinuous belts, suggesting highly localized subduction geometry involving unusually steep down-going slabs. The global distribution correlates strongly with [continental fragments](/…