Supplemental Material: Kilometers-scale subsidence of the inner Puerto Rico Trench wall since the Pleistocene

Sample preparation, sample description, and biostratigraphic ages from our ROV dive on the south flank of Mona Block. It also quotes the description and ages from DSV Alvin dive 461 by Heezen et al. (1985). Finally, it also presents available seismic reflection profiles used in the discussion and outlines the processing steps used to improve their quality.