THE STRUCTURE OF THE SOUTH-WESTERN PART OF THE SYKES ANTICLINE, BOWLAND, WEST YORKSHIRE

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Abstract
Summary: The Carboniferous succession exposed along the Sykes Anticline includes the upper part of the Viséan Series and the lower part of the Namurian Series. The Viséan succession consists of the upper 350 feet of the Worston Group and the Lower Bowland Shales. The Namurian strata of lower Pendleian (E 1 ) age include the Upper Bowland Shales and the Pendle Grit. The sequence is conformable and very similar to that described by Parkinson (1936) in the adjacent Slaidburn district. The anticline is a concentric fold with relatively competent upper and lower levels separated by an incompetent sandwich of shales. The upper level (Pendle Grit) has the general form of a boxfold with dips of about thirty-five degrees on the limbs, an axial zone about a mile wide and a trend of 045 degrees. The lower level (Worston Group) is tightly folded into en echelon periclines with vertical and overturned strata common, and a mean axial trend of 027 degrees. The difference in tectonic style between upper and lower structural levels is attributed partly to the normal process of concentric folding, with the crumpled limestones indicating a lower limit to this, and partly to the disharmony of the Bowland Shales. Dip, strike and oblique joints are found in several well-defined sets, each set related to the anticlinal structure and approximately normal to the bedding.

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