 There are three different sources of sediment to the deep sea sedimentary record. The first is to originate material that is delivered via rivers into the oceans. The second is dust that is blown in from the continents by winds. And the third is biogenic material formed by organisms that lived in the surface of the ocean that die and then subsequently rain down through the water column to the sea floor. As a source, these types of material are buried in the deep sea sedimentary record. The nature of the sedimentation process is such that the youngest material lies close to the sea floor and as the sediment becomes progressively deeper, it becomes progressively older. Thus the deep sea sedimentary record provides a beautiful inventory of ancient climate from younger to older.