Abstract
A section at Foscott, near Buckingham exposes c. 2.5 m of Cornbrash overlying Blisworth Clay. The Lower and Upper Cornbrash (recently formalised, with emendations, as the Berry and Fleet members of the Abbotsbury Cornbrash Formation) are c. 2.2 m and c. 0.3 m thick respectively. The Upper Cornbrash, generally unknown between Oxford and the Bedford area, is described; its upper part is a richly fossiliferous marl, locally a limestone, with a macrofauna dominated by ‘myid’ bivalves ( Goniomya, Gresslya and Pleuromya ) and echinoids ( Nucleolites ). The lower part of the Upper Cornbrash is an oyster bed with Liostrea undosa (Phillips) and Lopha marshii (J Sowerby). Specimens of Macrocephalites from the fossiliferous marl indicate the Lower Callovian, Herveyi Zone, Kamptus Subzone of Page (1989). The Lower Cornbrash sequence is also described.
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