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Rock Quarry In North Western Pa

Units of weaker, muddy breccia rock. north western part of the quarry either on moderately dipping seams in the breccia rock, or on a combination of the seams in the breccia and steeply dipping contacts within units of muddy breccia rock. 3. no evidence of failures in the eastern quarry face has been observed in the field or from aerial.


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