OR/14/029 Modelled surfaces/volumes

Geological units modelled

In total, 64 superficial and artificial geological units were modelled (including mass movement deposits). Table 1 lists the units in broad stratigraphic order together with the BGS stratigraphic lexicon code for each (see https://www.bgs.ac.uk/lexicon/) and lithology. Standard BGS map colours have been used for all superficial units in the model (Figure 2). These should be referred to when viewing images of the model in this report. Note that the Head and Clay-with-flints deposits are known to be polycyclic, and in the case of the latter, its formation is likely to have started as early as the Pliocene

Inferred age	LEXICON CODE	Full name	Lithology
Holocene deposits and artificially modified ground	slip	Landslide deposits	Mass movement deposits; variable composition, dependent on the nature of the upslope material
	wgr	Worked Ground	Artificially lowered area, or void, through man-made excavation, e.g. a gravel pit
	mgr	Made Ground	Artificially raised areas, variable composition
	wmgr	Worked & Made Ground	Area of artificial cut and fill, e.g. a backfilled quarry, variable composition
	ddgr	Disturbed Ground	Area of disturbance associated with surface or near-surface collapse
	lsgr	Landscaped Ground	Extensively remodelled areas where it is difficult to delineate zones of Made, Worked or Disturbed Ground. Variable composition
	peat	Peat	Humic deposits, consisting of wet dark brown partially decomposed vegetation
	tufa	Tufa	Inorganic calcium carbonate or sinter deposited at or near springs and seepages
	alv	Alluvium	Fluvial deposits of modern flood plains, consisting of clay, silt, sand and peat
Holocene deposits and artificially modified ground | slip | Landslide deposits | Mass movement deposits; variable composition, dependent on the nature of the upslope material