Abstract
We assessed the utility of δ13C and bulk geochemistry (total organic content and C:N) to reconstruct relative sea-level changes on the Cascadia subduction zone through comparison with an established sea-level indicator (benthic foraminifera). Four modern transects collected from three tidal environments at Siletz Bay, Oregon, USA, produced three elevation-dependent groups in both the foraminiferal and δ13C/bulk geochemistry datasets. Foraminiferal samples from the tidal flat and low marsh are identified by Miliammina fuscaabundances of > 45%, middle and high marsh by M. fusca abundances of
Keywords
Bulk geochemistry, Cascadia, earthquake, Foraminifera, Oregon, Paleoseismology, Relative sea level, δ13C