Secondary Trend Components in the Top Ashdown Pebble Bed: A Case History

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Abstract
Trend surfaces for mean particle size, mineral frequency, and bed thickness, from which inferences regarding sedimentary provenance and environment may be based, are extracted from Top Ashdown Pebble Bed data in the Wealden (Lower Cretaceous) of southeastern England. These systematic trends and the deviations from them show that a series of small-scale cross-trends is superimposed on the systematic trend components. Hence it is possible to set up a "facies model" accounting satisfactorily for the intricately interlocking source areas feeding detritus to the area. A principal purpose of the present "case history" is to demonstrate that trend surface techniques using high-speed computers can establish quickly and firmly what more laborious and subjective methods only suggested over two decades of conventional work. Thus the techniques of twenty years ago are contrasted with those used at present for analyzing and interpreting certain kinds of "noisy" geological data.
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