A varied sequence of greenish grey, silty, moderately shelly and calcareous mudstones, pale greenish grey shelly marls and fine-grained shelly limestones with marine and freshwater faunas. Rootlets are common, and some mudstones display seatearth textures and more variegated
colours, also indicating shallow, proximal conditions. Subordinate siltstone and sandstone beds are present near the base of the formation.
Lithogenesis: Fluctuating very shallow marine/paralic/emergent environment. A steady input of fine terrigenous material is apparent.
Vertically, the Sharp's Hill Formation has a lower non-sequential boundary with the Chipping Norton Limestone Formation or the Horsehey Sand Formation. At its upper boundary it is conformably overlain by ooidal and shelly-detrital limestones of theTaynton Limestone Formation. Laterally, the Sharp's Hill Formation passes in the south-west into the Fuller's Earth Formation.
Spatial ditribution: North Oxfordshire north-east of Milton-under-Wychwood and Minster Lovell.
Type section: Sharp's Hill Quarry, Sibford Ferris (SP 338 359). Reference section: Horsehay Quarry, Duns Tew. (SP 456 273). At the reference section 4.6 metres of the fomation (clay, calcareous clay and fine-grained limestone facies) grounded on the Chipping Norton Limestone, is exposed.
Landform contribution: together with the Horsehay sands (if present) it generally forms hollows between the more resistant, competent units of the Chipping Norton Limestone (below) Formation and the Taynton Limestone Formation (above).