1. Barth “The Crystallisation Process of Basalts”,Amer. Jour. Sci., 1936,31, 321–51.
2. Benza and Cullen “Notes, Chiefly Geological of a Journey through the Northern Circars in the year” 1835,5, 53–70 (1837).
3. Das Gupta “On the age of the Fossiliferous beds at Duddukur, Madras Presidency”,Quart. Jour. Geol. Min. Met. Soc. India, No. 2, 1933, 59–66.
4. ElliotJour. As. Soc. Bengal, 1854,13, 397.
5. Fermor “Basaltic Lavas penetrated by deep boring for Coal at Bhusawal”;Rec, Geol. Surv. India, 1926,58, 93–240.