... With the aid of improved technologies for coring materials and data analysis, it could be said that scientists from then were encouraged to look at other sources of information (i.e. cores from ice sheets) for an even broader source range. Marine Evidence Ocean sediments provide a very much more complete geological record (Press and Siever 2000), partly due to the highly efficient preservation of sediment (Lowe and Walker 1997). Striae for example are best protected from weathering in sub marine conditions (or, when exposed to the surface, covered in 0.4-0.5m of till) (Kleman 1990). However, the top 50cm of sediment can be subject to bioturbation from marine organisms effectively 'blurring' the information. The sediment that does form from process such as ice rafting occur very slowly, but are very detailed with both organisms, elements such as Al, Ba, Ca, Cd and isotopes of C, O and U available for study for determining ...

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