Grain size distributions of 311 sediment samples from Sites U1450 and U1451 of International
Ocean Discovery Program (IODP) Expedition 354 were determined using laser diffraction.
Most of the samples were from turbidites, but some hemipelagic beds were also examined.
The mean grain size values show that silt-sized particles are the dominant textural
class, whereas the grain size values range from clay to coarse-grained sand. An overall
upward change in mean grain size value reveals a slight coarsening-upward trend. However,
other parameters such as standard deviation, skewness, and kurtosis show no systematic
relationship with depth in the holes. The analyzed samples cover the age range from
recent to early Miocene. Shepard textural classification plots show the sediments
are mostly sandy silts, silty sands, and clayey silts with a few silts and sands also
present. Frequency curve plots of samples from individual turbidite beds show inversely
graded beds are most common at Site U1450, whereas thicker massive beds are dominant
at Site U1451.