Abstract

Geophysical log correlation, when calibrated against cored borehole sequences, enables the relatively inexperienced geologist to subdivide the 340m of Callovian, Oxfordian and Kimmeridgian strata of the Eastern England Shelf into stratigraphical units of substantially less than zonal scale. The correspondingly detailed knowledge of shelf evolution shows the entire area to have subsided in distinct pulses which increased in strength with time, measured radiometrically, reaching a maximum in early to mid-Kimmeridgian times. The strength of the pulses varied geographically so that the northern shelf margin, the Market Weighton Block, was subject to more rapid changes in subsidence than the southern margin, the London Platform. Comparable pulsatory subsidence occurred in the Weald and Dorset Jurassic basins and adumbrates widespread tectonic events in NW Europe. An understanding of these subsidence patterns is a prerequisite to any detailed study of the sedimentation history or hydrocarbon potential of English Upper Jurassic strata.

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