Fig. 2 in The changing course of the Amazon River in the Neogene: center stage for Neotropical diversification

Fig. 2. Summary of terrigenous signals from drilling cores near the mouth of the Amazon River. Sediment dating of cores in the Amazon Fan (red; Hoorn et al., 2017) and Ceará Rise (blue; van Soelen et al., 2017). a. Ratios of stable Neodymium isotopes expressed in epsilon notation: eNd(0). b. Crustal residence times (DM). Note values of both parameters change through time T according to the provenance of the preserved terrigenous material. eNd(0)<-15 and a DM>1.67 Ga reflect a primarily cratonic source. Both theT Amazon Fan and Ceará Rise record significant changes away from a cratonic source (towards an Andean source) by c. 9-7 Ma.