... rock extend laterally until physically constrained in some way; this may be a shoreline or an upstanding relief feature. These principles allow a rock sequence to be seen as a record of geological events over time, with the oldest rocks representing the most ancient events at the bottom of the sequence. Stratified rock bodies and indeed rock bodies must not however be seen as static. Tectonic activity may have influence any area at one period during geological history, and a stratified rock sequence may have a different orientation to that of its formation period. Different methods can be used to establish it original way up. Sedimentological evidence can be used. During the formation of marine sedimentary rocks, sediments would be deposited, with the coarser sediment particles being deposited first. A single stratum will represent this period of sediment deposition, and the way up of the whole sequence can then ...

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