Marine geologists determine the distribution of sediments by coring the
bottom of the oceans. They look at the sediments recovered and then
analyze them for the different components, like clay and biological
When you plot all the different components in the surface layers, you
can observe a pattern that reflects the overlying oceans. You can group
the sediments into clay, calcareous, siliceous, and glacial.
Clay deposits refer to small particles that are associated
with weathering. Glacial deposits are associated with erosion due
to ice. These are also considered a terrigenous deposits or
originating from land.