Long-term cycles of Triassic climate change: a new δ18O record from conodont apatite

A new oxygen isotope (δ18O) record derived from conodont apatite reveals variable long-term climate trends throughout the Triassic period. This record shows several major, first order, negative shifts reflecting intense warming episodes, not only the well-known extreme PTB–Early Triassic event (∼5‰), but also two large cycles of similar magnitude (∼1.5, ∼1.7‰) and duration (∼7 Myrs) during the late Carnian and late Norian. Between the PTB–Early...