���We’re pretty much standing on the KTB extinction because of these lava flows,” says Gerta Keller. She’s talking about the Rajahmundry quarries where she made a field trip recently. The Cretaceous-Tertiary Boundary (KTB), which Keller invokes while standing in a big hole gouged out in one of the quarries, was the period when the majority of species, including non-avian dinosaurs, vanished from the fossil record. The scene could be from Hades but without the searing heat. Summer