Individual beds can be up to a few meters thick, and many are traceable across the whole plain.
The first turbidites rapidly infilled the fracture zone valleys through the middle Miocene. By 16 Ma, the fracture zones were nearly filled, and flows began to spread across wider areas to form the plain. Accumulation rates of the three principal groups of turbidites increased between 7 and 6.5 Ma, and remain high to the present day. The pelagic interbeds are composed of clay through the Eocene to middle Miocene, but at 8 Ma, they show a small increase in carbonate content. Holocene sediments is dominated by oxic processes that occurred when organic-rich turbidites were first emplaced on the plain.