DEEP CHANNELS, MASSIVE BEDS AND TURBIDITY CURRENT GENESIS IN THE CENTRAL PENNINE BASIN

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Summary: The coarse sandstones which fill channels cut into the upper part of the Grindslow Shales form the base of the Kinderscout Grit. They differ in character from the fills of similar channels, in the lower parts of the Grindslow Shales and in the Shale Grit, which have been interpreted as turbidites. The deposits of the higher channels are of three facies: massive, horizontal and medium scale cross-bedded coarse sandstone. These occur in a preferred order, which, on the basis of the hydrodynamic interpretation of the facies, is thought to represent a waning flow sequence. The deposition of the massive bedded facies is probably due to a rather rapidly decelerating fluviatile current, depositing from suspension and/or a traction carpet and possibly associated with antidune bedforms. These deep fluviatile channels are confined to the upper part of the Grindslow Shales, which is thought to be a delta top deposit. The turbidite filled channels are confined to the delta slope deposits of the lower part of the Grindslow Shales. It is suggested that during floods, sediment laden traction currents developed autosuspension at the top of the slope and flowed down the slope in channels, to give turbidites of a non-resedimented nature.

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