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Structures attributed to the upward escape from anastrophic burial of specimens of Archanodon catskillensis (Vanuxem) (Archanodontidae) in the basal sandstone member of the Late Devonian Catskill Formation in northeastern Pennsylvania and equivalent beds in southern New York and northern New Jersey exhibit the following vectorial features: (1) preferential curvature (in vertical section), (2) ellipse parallelism (in bedding plane cross sections), and (3) internal crescent asymmetry (also seen in vertical section). The utility of these vectorial features in the reconstruction of past sedimentary environments depends upon the discovery and understanding of a suitable Holocene analogue Populations of Margaritifera margaritifera (Linné)...

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