1. Schardt, H., C.R. Acad. Sci., Paris, 117, 707 (1893): Arch. Sci. Phys. et Nat., Genève, 3rd ser., 30, 570 (1893).
2. Griesbach, C. L., Rec. Geol. Surv. India, 26, 19 (1893).
3. Krafft, A. von, Mem. Geol. Surv. India, 32, 127 (1902).
4. Diener, C., Mem. Geol. Surv. India, 36, 132 (1912).
5. Griesbach, C. L., Rec. Geol. Surv. India, 26, 25, which carries an editorial note that "Mr. Middlemiss does not accept this explanation" (1893).