1. Institute of Geological Science Borehole at Duffield, Derbyshire;Aitkenhead;Bull. Geol. Surv. GB,1977
2. The Carboniferous goniatites of the north of England and their zones;Bisat,1924
3. The Carboniferous goniatites of England and their continental equivalents;Bisat,1928
4. Controls on the sedimentation of the Rough Rock group from the central Pennine Basin of northern England;Bristow,1988
5. Distribution of Westphalian marine faunas in northern England and adjoining areas;Calver,1968