Discussion by Alwyn Williams 9-9-74 Towy Anticlinorium NE NW deepening basin w. clastics typical superbasin SW SE. Caradocian - linear anticlinorium at inception. at sites along NW-SE ripples various parts of High CH4C5 (Tellichan) sits uncomfortably on lower Blandeiio. Troughs (crossfolds) on anticlinorium. Blaenwern Breith - volcanic complex w. apolites, intermed, rx + ground Blaendindon phylades up & Blaendindon - an island. watershed E of W. - sides N side no sediment. S side has a lot of sediment. Blaendeilo sedimentary basin of sh. + late; then outer ring of grapelitic shales Abnormal development of Blandeiio & Blanwern series. Blaendeilo wedge in Welsh Basin.