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Siccar Point_Devonian Period

Rock & Gem Kids: Geology 101 – Unconformity

By Jim Brace-Thompson Sediments build up in layers, giving us a geological record. An unconformity records a gap in that record. For instance, there may...
Sharp Chalcopyrite crystals

Chalcocite Crystals of Bristol Copper Mines

Editor's Note: This is the first in a two-part series about the copper mines of Bristol, Connecticut. Story by Bob Jones Although many mineral collectors...