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In page Frankford Township, New Jersey:

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Most of Frankford Township is on the Ordovician Martinsburg Formation.[1] This is a shale, slate, and limestone formation created 450 million years ago when a chain of volcanic islands collided with proto North America. This is a dark, almost black, shale. However the Jacksonburg formation rides over the Martinsburg shale in most areas. This shale is silver in color in the inside of the shale.[citation needed]