Fig. 10From: Is the relative thickness of ammonoid septa influenced by ocean acidification, phylogenetic relationships and palaeogeographic position?Correlation of abiotic factors, time scale after Cohen et al. (2013). A septal slope factor versus time (blue line: the average); B atmospheric CO2 (Witkowski et al., 2018). C isotopic temperature after Veizer and Prokoph (2015. D Ion ratios of Mg/Ca and SO4/Ca after Arvidson et al. (2011)Back to article page