Methods

Abstract

Numbering of sites, holes, cores, and samples Expedition numbers for IODP expeditions are sequential, starting with 301. Drilling sites are numbered consecutively, and for a European Consortium for Ocean Research Drilling (ECORD) Science Operator (ESO)-operated platform, numbering starts with Site M0001 (the "M" indicates the ESO-operated mission-specific platform [MSP]). For Expedition 313, the first site was Site M0027. Although not applicable to Expedition 313, multiple holes may be drilled at a single site. For all IODP drill sites, a letter suffix distinguishes each hole drilled at one site. The first hole drilled is assigned the site number with the suffix "A," the second hole takes the site number and the suffix "B," and so forth. For Expedition 313, only one hole was drilled at each site, so all holes take the suffix "A." The cored interval is measured by the drillers in meters below seafloor (mbsf). The depth below seafloor was determined by subtracting the initial drill pipe measurement to seafloor from the total drill pipe measurement. For Expedition 313, the cored interval normally consisted of the entire drilled section, but in some cases intervals were drilled without coring (e.g., the top of Hole M0028A and other intervals between spot cores). Recovered core is split into sections with a maximum length of 1.5 m and numbered sequentially from the top, starting at 1 (Fig. F1). By convention, material recovered from the core catcher of a sedimentary core is treated as a separate section labeled "CC" (core catcher) and placed below the last section recovered in the liner. The core catcher is assigned to the top of the cored interval if no other material is recovered. When recovered core is shorter than the cored interval, the top of the core, by convention, is equated Methods 1 Expedition 313 Scientists 2 Chapter contents Introduction .