Geoscience Reference
In-Depth Information
6
Figure 6.14
Three-dimensional block model and idealized cross-section to illustrate the depositional
environment interpreted for the Long Nab Member, Yorkshire, UK. The right-hand part of the cross-section
relates directly to the deposits at Cromer Point shown in Figure 6.11c and d. (From Alexander 1992.)
6.5 Using sedimentary rocks
to interpret climate change and
sea-level change
Marine and lacustrine sedimentary records are unique
because below storm wave-base in the oceans and in lakes
sedimentation can be fairly continuous over hundreds of
thousands and even millions of years. This continuous
record can be correlated with the usually less complete
nearshore and terrestrial records. Together these sedimentary
records enable us to collect information on how the Earth's
surface environment has progressively changed over time.
The processes that occur on the land surface and near-shore
environments affect those in the ocean. The position of sea-
level infl uences both land and ocean processes because
