| http://www.w3.org/ns/prov#value | - Such metals as gold, silver, copper, lead, zinc, molybdenum, tungsten, tin, iron, and manganese were concentrated into ore deposits of various dimensions during episodes of igneous activity in the late Mesozoic.Major subdivisions of the Cretaceous SystemThe rocks that were either deposited or formed during the Cretaceous Period make up the Cretaceous System.
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