Geology field studies from Lleyn to PlynlimonThis book has been produced to assist A level and adult education geology students carrying out field work in North and Mid Wales. The region provides an outstanding range of geological features: turbidite sediments, major and minor igneous intrusions, extrusive rocks including pyroclastic ashes and pillow lavas, regional and contact metamorphic rocks, fold and fault structures, and heavy metal mineralisation. These features are often displayed in