Abstract
This paper is a preliminary report on the hydrogeology of the Magnesian Limestones in Yorkshire, between the River Wharfe and the River Aire. Information has been collected in a desk study and a limited field exercise. Although overall abstraction from the aquifer is only 15 percent of the estimated average annual recharge, the concentration of several major abstractions in the Tadcaster area was a cause of concern. As a result of this investigation, groundwater movement within the two limestone aquifers is better understood, particularly the importance of the influence of faulting on groundwater movement and borehole yields.