Palaeoenvironments and palynofacies of a pulsed transgression; The Late Devonian and Early Dinantian (Lower Carboniferous) rocks of southeast Wales.
Reference:
Davies,J.R. et al. (1991)
Palaeoenvironments and palynofacies of a pulsed transgression; The Late Devonian and Early Dinantian (Lower Carboniferous) rocks of southeast Wales. Geological Magazine
Vol. 128 # 4 P. 355- 380