1. Selsey Bill, Historic and Prehistoric, Edward Heron-Allen, 1911, p. 63.
2. Tertiary and Post-Tertiary Geology of Mull, etc.;Mem. Geol. Surv.,1924
3. Tiddeman , Brit. Ass. Report, 1900, p. 761.
4. Geology of East Fife;Mem. Geol. Surv.,1902
5. Geology of East Fife;Mem. Geol. Surv.,1902