R. S. Arthurton and A. J. Wadge 1981. Geology of the country around Penrith. With contributions by J. Pattison; M. Mitchell; A. W. A. Rushton and T. R. Lister (palaeontology); R. K. Harrison (petrography); F, Collar (geophysics) and J. L. Farr (hydrogeology). Mem. Geol. Surv. G.B. Sheet 24. xii + 177 pp. 47 figs. (3 in colour); 13 plates (4 colour); 7 tables. London: H.M.S.O. Price not stated. ISBN 0 11 884142 4.