Spatial aspects of concretionary growth in the Upper Lias of Northeast England

R. Raiswell; Sir Nicholas White

doi:10.1016/0037-0738(78)90059-3

Spatial aspects of concretionary growth in the Upper Lias of Northeast England

Sedimentary Geology 20: 291-300

Article 1978 English

Abstract

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Spatial distribution, size and orientation measurements on 143 concretions from the Jet Rock (Upper Lias) of northeast England are reported. The distribution of concretions conforms to a Poisson or random model at the scale sampled. Approximately 30% of the Jet Rock concretions are sufficiently asymmetrical in bedding plane section for a major axis orientation to be recorded. Orientations cluster in the range 10–30°, possibly indicating a preferred direction of pore water transport in the bedding plane during compactional expulsion.

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Spatial aspects of concretionary growth in the Upper Lias of Northeast England

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