Fig. 3From: Systematics, endemism and phylogeny of Indian proplanulitins (Ammonoidea) from the Bathonian–Callovian of Kutch, western IndiaStratigraphic column of Keera section illustrating biostratigraphy and vertical distribution of Sivajiceratinae and other important ammonite taxa. Biozonation is modified after Jana et al. (2000, 2005) and Bardhan et al. (2012). Star indicates the holotypeBack to article page