Abstract
Summary Upper Permian rocks exposed at Quarry Moor, Ripon, Yorkshire, comprise about 7.2 metres of thick-bedded porous oolitic dolomite overlain by about 5.5 metres of varied, mainly thin-bedded, limestones and dolomites with thin argillaceous and earthy beds. They lie at the top of the Lower Magnesian Limestone, and may include the lowest beds of the Permian Middle Marls. Algal lamination is present in the uppermost 9 metres, where textural evidence suggests that the limestones originated by calcitization of earlier dolomite rock (dedolomitization). Most of the rocks exposed were deposited at or near sea level and it is suggested that the contortion and brecciation in some of the higher beds took place during the formation, diagenesis and subsequent dissolution of displacive evaporites. The calcitization is thought to have taken place when intergranular gypsum or anhydrite was dissolved, probably near the ground surface during the current cycle of uplift and erosion.
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