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comprise dense fine to medium silty sands, with increasingly silty and clayey layers present at depth, especially where channel features are present.


104. The upper layers of YM are interpreted as being contemporaneous with the Cromer Forest Bed Formation of East Anglia, within which the Lower Palaeolithic sites at Happisburgh and Pakefield have been (Parfitt et al. 2010, Parfitt et al. 2005). As such, there is the potential for both in situ and reworked archaeological and palaeoenvironmental material to be present within the upper layers of YM. The potential for archaeological material of this age within the offshore region is considered greatest where later YM deposits are associated with features cut into earlier Pleistocene or pre-Pleistocene formations. Due to the extensiveness and complexity of the upper YM features have not been mapped individually, and the unit is interpreted as a delta-top rather than a single channel river system.


105. An area of High Amplitude Reflectors has been identified within East Anglia Three. Although actually interpreted as being part of the upper YM, these features are of particular potential archaeological and palaeoenvironmental interest and so are described separately.


106. The High Amplitude Reflectors are represented by features 75529, 75530, 75532, 75533 and 75534, all of which are located in one area at the northern boundary of the East Anglia THREE site (Figure 17.2). These are generally strong, sub-horizontal reflectors cut in a number of places by later channels (described below), and possibly represent peat horizons or organic clay indicative of a buried terrestrial surface (Figure 17.9).


107. These deposits are considered of high archaeological potential, as they could contain and protect in situ Lower Palaeolithic archaeological artefacts and intact organic material suitable for high-resolution palaeoenvironmental analysis.


108. As previously mentioned, a series of Channel Features have been observed cutting through the High Amplitude Reflectors, and elsewhere across East Anglia Three, into YM. Although classified as Channel Features, this unit contains features classified as both Channels and Cut and Fills - features which could not be traced extensively between survey lines. The Channel Features are widespread across the East Anglia THREE site (Figure 17.2), though the two largest features (75484 and 75497, see Appendix 17.3 for full list) are located towards the northern end of the area.


109. These features tend to be relatively well-defined and characterised by numerous internal sub-parallel reflectors (Figure 17.10), though a number of less well-defined features contain an acoustically chaotic fill have also been identified.


Preliminary Environmental Information May 2014 East Anglia THREE Offshore Windfarm Appendix 17.2 Archaeological Review of


Geophysical and Geotechnical Data: Technical Report


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