An early Ordovician shore-line in Radnorshire, near Builth Wells

Abstract
This paper deals mainly with the western margin of the Builth-Llandrindod Ordovician inlier and is concerned with the phenomena associated with the unconformity between the Newmead Series and the underlying Builth Volcanic Series. The rocks dip westwards and strike approximately north and south. They are extensively faulted and, in particular, the outcrops are displaced by powerful tear-faults.