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Diabase or “trap rock.”  Diabase results from magma that intrudes into pre-existing bedrock from below and subsequently cools within bedrock voids to form a “dike” or “sill” (depending on its orientation).  Popular names for this stone are whinstone, greenstone, toadstone, and trap.  It was quarried for railroad ballast, concrete aggregate, and surfacing for roads since it is tough, durable, and resistant to wear.

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Photographs by Valerie Lykes