On the Cambrian Conglomerates resting upon and in the vicinity of some Pre-Cambrian Rocks (the so-called Intrusive Masses) in Anglesey and Caernarvonshire

H. Hicks
1884 Quarterly Journal of the Geological Society  
doi:10.1144/gsl.jgs.1884.40.01-04.13 fatcat:e7p6ipl5ujgyvmly7xdtydc4hq