The oil source is in the lower Jurassic Blue Lias and the field stretches under the Eolian clays and sands of Poole Harbour, Poole and Bournemouth, and under the Cretaceous chalk hills and Jurassic limestone and shale of the Isle of Purbeck.
The oil source is in the lower Jurassic Blue Lias, with extraction from the Jurassic Bridport Sands and Triassic Sherwood Sandstones. The field stretches under the Eolian clays and sands of Poole Harbour, Poole and Bournemouth, and under the Cretaceous chalk hills and Jurassic limestone and shale of the Isle of Purbeck.