"Formation","FormDescription"
"I","Initial Collapse/erosion of feature edges resulting in rapid deposition"
"II","Realignment of feature profile resulting from gradual deposition with occasional more rapid deposition events. Where applicable, one of the following sub-categories should be used.  If the source of the material is unclear, then do not use a sub-category."
"IIA","Category II deposition where a significant proportion of deposit is believed to derive from breakdown of surrounding topsoil."
"IIB","Category II deposition where significant proportion of deposit is believed to derive from erosion/collapse of corresponding positive feature such as a bank."
"IIC","Category II deposition where significant proportion of deposit is believed to derive from feature sides/surrounding ground surface eg. Where Category IIa deposition has occurred, removal of topsoil may result in increased erosion of subsoil."
"III","Very slow final silting of feature generally resulting from deposition of wind/waterborne material derived from surrounding area."
"IV","Deliberate backfill."
"IX","Animal trample"
"VA","Low energy alluvial floodplain deposit."
"VB","Low energy alluvial feature fill."
"VI","Organic fill eg. formed in standing water within a pit."
"VII","High energy deposit eg. fluvial fills within a palaeochannel."
"VIII","Former land surface/turfline: most likely to be encountered within alluvial deposits at west end of Bed B but could occur within a ditch."
"X","Wind blown deposit"
"XI","Bioturbation"
"XII","Plough Furrow fill - created by act of ploughing"
"XIII","Colluvium - deposit formed through erosion of soils on a slope, often associated with deforestation and ploughing."