Figure 4

δ¹⁸O (‰) variation/diversity within the zones (1, 2, 3) and in compartmentalised Zone-2 (i.e., A and B) georeferenced and modified after (Shukla et al.¹⁷). A and B in Zone-2 accounts for maximum species of δ¹⁸O (‰) compared to Zone-1 and Zone-3.