"A detailed description is given of a band of peculiar calcareous concretions in the Jet Rock of the Yorkshire coast. Two separate phases of segregation and interstitial crystallization of CaCo 3 in bituminous shale have produced two distinct sets of calcite siltstone concretions. The earlier concretions are highly irregular in shape and are associated with small bodies of calcilutite, which exhibit a variety of structures including veining, colloform banding and microbreccias. A complex diagenetic history is deduced."

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