The Lower Carboniferous Rocks of the Castle Hill Fault Block, Tenby, Pembrokeshire

Abstract

The rocks of Castle Hill previously considered to be of Tournaisian age are now shown to be referable to he Dibunophyllum Zone. The revised age greatly simplifies the structure of the fault block.

The namurian succession between Tenby and Waterwynch, Pembrokeshire

“…These splays cause intense disturbance in the Carboniferous Limestone and lowest Namurian Beds and at one locality (The Beacon) shattered dolomitic limestones appear to be thrust over Namurian shales and sandstones with cherty bands. This disturbance and the poor exposure make estimates of thickness and of the stratigraphical relationships only approximate, No fossils occur in the shattered dolomitic limestones, but the limestones of Castle Hill have been shown to belong to the Dibunophyllum zone and probably the middle Dibunophyllum sub-zone (DZ) by Sullivan (1964), thus considerably lessening previous assessments of the throw of a splay of the Ritec Fault near Tenby Harbour.…”