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Concretion (view source)

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'''Concretion''', commonly discrete, rounded [[nodular]] [[rock]] masses formed and found in [[bedding|beds]] of [[shale]] or [[clay]].

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'''Concretion''', commonly discrete, rounded [[nodular]] [[rock]] masses formed and found in [[bedding|beds]] of [[shale]] or [[clay]].<reF>Pellant, p. 250</ref>

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Pellant, p. 250

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