- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
In addition to the previously identified D 2 zone (Carboniferous), beds of the upper Dibunophyllum zone (D 3 ) have been identified near Glynneath, south Wales. The position of the exposure, on the line of the Neath disturbance, is significant. The exposure is described, a detailed section given, the fauna listed, and the implications discussed.