摘要: Sediment cores were collected in the shallow and deep water areas off the Washington and Oregon coasts. Cores taken in deep water penetrated usually one, but sometimes two, stratigraphic units: a lower unit consisting of dark gray... 展开 Sediment cores were collected in the shallow and deep water areas off the Washington and Oregon coasts. Cores taken in deep water penetrated usually one, but sometimes two, stratigraphic units: a lower unit consisting of dark gray silty mud and an upper unit consisting of homogeneous olive gray mud. Differences between the two units are reflected in the physical properties measurements presented in this technical note. In general, the olive gray sediment is a homogeneous silty clay that is watery and poorly consolidated. The dark gray sediment, in contrast, is typically a clayey silt that is much firmer and less watery. The shelf sediment was found to contain greater amounts of coarse material and to be still firmer and less watery than the dark gray sediment. 收起