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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Palaeokarstic Surfaces in Upper Visean (Carboniferous) Limestones of the Derbyshire Block, England
Gordon M. Walkden
Undulating, hummocky and often deeply pitied discontinuities, commonly up to 1 m in amplitude, occur throughout D1 and D2 subzones in the Carboniferous Limestone sequence of the Derbyshire Block, England. Previously termed mammillated surfaces and potholed surfaces, these horizons usually underlie a thick K-bentonite clay and are shown to be Carboniferous erosion features that formed by subaerial solution beneath a cover of soil derived from volcanic ash. These palaeokarstic surfaces present evidence for contemporaneous lithification of the limestones, and brown laminated coatings are interpreted as caliche-type crusts similar to some modern examples. Surfaces of average development may each represent subaerial exposure of between 30,000 and 100,000 years, and certain karstic morpholo ies may reflect the influence of a near-surface water table.
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