Abstract
The lithostratigraphy of the Inferior Oolite (Aalenian/Bajocian Stages, Middle Jurassic) of Dundry Hill, near Bristol, Avon, is revised and several new lithostratigraphic units are erected: the Barns Batch, Grove Farm and Elton Farm Limestones. The depositional environment and present pattern of preservation of these beds are discussed, and four exposures at South Main-road quarry, Rackledown quarry, Barns Batch Spinney and Grove Farm are described. An analysis of the Aalenian/Bajocian ammonite faunas is given, and they are correlated with their equivalents elsewhere in southern England, particularly those recently collected from the Bruton district of Somerset. Finally the type horizons of the Sowerby's and Buckman's ammonite species are discussed, and the majority assigned to their correct stratigraphic position.
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