1. Cornstone;Allen;Geol. Mag.,1960
2. The highest Lower Old Red Sandstone of Brown Clee Hill, Shropshire;Allen;Proc. Geol. Assoc. London,1961
3. Barrow , G. W. Gibson , W. Cantrill , T. C. Dixon , E. E. L. Cunnington , C. H. 1919 The geology of the country around Lichfield Mem. Geol. Surv. 302
4. Le Miocene continentale du Bassin d'Aquitaine;Crouzel;Serv. Carte Géol. de la France, Bull.,1957
5. The Old Red Sandstone of Eastern Eckmanfjorden, Vestspitsbergen;Dineley;Geol. Mag.,1960