Figure 1: Palaeolatitudinal distribution of chelonians and other tetrapods through the Mesozoic.
From: Climate-mediated diversification of turtles in the Cretaceous

(a) Non-marine and (b) marine: open circles—tetrapod occurrences; green circles—chelonian occurrences. J, Jurassic; K, Cretaceous; Tr, Triassic. Circles identified with numbers represent specific PBDB collections mentioned in the text.