STRATIGRAPHY AND PALYNOLOGY OF EARLY DINANTIAN (CARBONIFEROUS) STRATA IN SHALLOW BOREHOLES NEAR RAVENSTONEDALE, CUMBRIA

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Abstract
SUMMARY: Six shallow boreholes in the Ravenstonedale area, Cumbria, have proved strata near the base of the Dinantian succession and these are related to nearby outcrops. The marine Pinskey Gill beds are 45 to 50 m thick and the overlying fluviatile Shap Conglomerate is about 40 m thick. About 42 m of marine Stone Gill Limestones occur between the Conglomerate and the lowest limestones exposed in the Stone Gill section. The boundaries between the three formations are gradational and there appears to have been no major break in deposition. Miospore assemblages belonging to the CM zone occur in all three formations, but the higher part of the Stone Gill Limestones proved in the boreholes, may be of Pu zone age. The Pinskey Gill beds were deposited during a Courceyan marine transgression and most of the Shap Conglomerate was laid down in the succeeding regressive period. Renewed marine transgression, probably at the base of the Chadian, is indicated by the higher part of the Shap Conglomerate and the basal Stone Gill Limestones.

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