Revision as of 02:22, October 1, 2007

Concretion, commonly discrete, rounded nodular rock masses formed and found in beds of shale or clay.

Pellant, p. 250

Sources

Pellant, Chris. The Complete Book of Rocks and Minerals, Dorling Kindersley Inc.: New York (1995)

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

	Pellant, p. 250		Pellant, p. 250