OR/13/001 Model assumptions, geological rules used etc

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Buried river terrace deposits were assumed to extend beneath and match of the distribution of overlying alluvium and intertidal deposits in river channels except in estuaries were more confined buried channels are found. The deposits die out upstream and are not found in the upper reaches of small streams and brooks. Only the silt rich ?reworked Aeolian head deposits have been modelled the other head deposits shown on the mapsheeet are thin and have not been included in the modelling exercise. Worked, Made and Worked and made ground have been constructed in sections and mapped polygons

have been inserted into the geological units however helper sections have not been constructed to allow 3D volumes of these areas within the model stack. calculation. Helper sections usually only correlate the units they are intended to inform The Chalk group is treated as a single unit The Lower London Tertiaries comprise mainly Reading Formation overlying deposits of the Thanet Sand Formation as noted from surface outcrops and some boreholes.