The paper reviews the geology of the Triassic in east Devon and west Somerset, presenting new information relating to aquifer thickness and the changes in particle size, which takes place latitudinally. These factors, together with the degree of cementation of the strata, are shown to have a great influence on infiltration, storage and yield. The chemistry of the ground-water is described, and the combined influences of the geology and ground-water chemistry are considered, in relation to the future development of the aquifer.

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