Chronological framework
This protocol is extracted from research article:
Strong local, not global, controls on marine pyrite sulfur isotopes
Sci Adv, Feb 26, 2021; DOI: 10.1126/sciadv.abb7403

Over the past 1.9 Ma, for both drill cores, we constrain the geochronology of the investigated sediment by tuning previously reported benthic δ18O measurements to the Lisiecki and Raymo (34) δ18O stack (fig. S1). These age models are, for the most part, similar to previously constructed age models at the shelf location (31, 32) and at the offshore location (33). For older sediment, where no foraminifera δ18O measurements were available, we used biostratigraphic and/or magnetostratigraphic information reported by the IODP/ODP sampling parties [fig. S1; (35, 59)]. Note that in the deep location, we removed the debris flow interval between ~543 and 550 mbsf to obtain an undisturbed record. For each sedimentary record, sedimentation rates were inferred at the depth of each δ34Spyr measurement by calculating the linear sedimentation rates implied by the age models.

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