Sandstone and the Triassic St Bees Sandstone. Both of these

(Fig. 1). The Vale of E d e n was initiated during the Devonian, as a result of faulting on the western margin of the Pennine uplift. Uplift and erosion of the Lake District, and further movement on the Pennine Fault at the end of the Variscan Orogeny (late Carboniferous) led to the establishment of an inter-montane basin in which a thick Permo-Triassic sedi-mentary sequence accumulated (Ander ton et al. 1979; Holli-day 1993). This Permo-Triassic sedimentary sequence (Fig. 2) includes two important sandstone units: the Permian Penri t