Coastal dysoxia accompanies Early Miocene warming based on benthic foraminiferal and sedimentary records from Oregon

► The Newport Member provides a test for shallow-water dysoxia during global warming. ► Abundances of Buliminacea, Fursenkoina, and Nonionella increase after warming. ► The δ13C offset between semi-infaunal and infaunal species suggests high organic flux. ► Laminated sediments increase and bioturbation decreases suggesting low oxygen. ► Organic-rich, low-oxygen conditions may be analogous to hypoxia in modern Oregon.