Bulk density measurements are compared with CaCO3 and spectral values. Bulk density was determined with the shipboard gamma ray attenuation (GRA) densitometer (Gersonde, Hodell, Blum, et al., 1999). In this study, the raw data were evaluated hole by hole. Adjacent measurements differing by more than ~8% in a single hole were eliminated. Then all Site 1090 data were combined and sorted by meters composite depth. A five-point running average was used to smooth the data (Table T2). The measurements are shown plotted vs. depth and weight percent CaCO3 in Figure F4A and F4B. The weight percent CaCO3 values roughly parallel the bulk density values.