Scanning X-ray fluorometry (XRF) data were collected from the split surfaces of cores EW0408-32MC, -32TC, and -33JC (see Addison et al., 2013; doi:10.1002/jgrc.20243). Using the composite depth scale and alignment of the XRF data from the three cores, a continuous XRF data splice was generated. This splice uses the following depth horizons: 0.0-0.27 m bsf in EW0408-32MC; 0.272 – 0.65 m bsf in -33TC; and >0.65 m bsf in -33JC. This data release specifically focuses on the scanning XRF datasets for bromine (Br) and chlorine (Cl), as the Br/Cl ratio has been shown to reflect variations in primary productivity (see Addison et al., 2013; doi:10.1002/jgrc.20243 ). In addition to the raw counts per second units for Br and Cl, statistical calculations are also included: the geometric mean of all X-ray counts, which is in turn used to calculate the centered natural-log-ratio (clr) transformations of both Br and Cl. The resulting clr Br / clr Cl ratio is calculated, and a two-part linear background is removed from the dataset to correct for sediment compaction. The detrended clr Br / clr Cl data are presented in their native format, as well as being normalized to Z-scores; raw and 10-yr multi-pass smoothed data are included in this data release. A multi-decadal (40-yr) variance calculation is also included.