OR/14/035 Modelled surfaces/volumes

THORPE, S, BURKE, H, WHITBREAD, K. 2013. Model metadata report for the EA Tees 3d Model. British Geological Survey Internal Report, OR/14/035.

A list of the units modelled is given in table 1.

There was no defined regional stratigraphy for the Teesside area prior to modelling. The lithostratigraphy used to define the modelled geological units was defined following a literature review and initial borehole inspection. The nomenclature for the stratigraphic units, particularly the Quaternary Deposits, was chosen for consistency with previous work for the Environment Agency in the Durham area to the north (Price et al. 2007). It should be noted that the lithological consistency of the units in Teesside with type-sections from the Durham area is assumed based on borehole records and has not been verified in the field.

Table 1 Generalised vertical section (GVS) used in the Teesside 3d Model.

name	id	Strat_text	LEX_code	Lith_code	Description	Age	Permeability
water	1	water	water	water	water	Recent	Aquifer
mgr	10	Made ground	MGR	UNKNOWN	Artificial and man‐made deposits	Recent	Aquifer
bsa	20	Blown Sand	BSA	S	Fine grained sand	Recent	Aquifer
peat1	30	Upper Peat	PEAT1	P	Organic peat	Recent	Aquitard
bchd	40	Marine beach deposits	BCHD	SV	Sand and gravel	Recent	Aquifer
alv	100	Alluvium	ALV	CZSV	clay silt sand and gravel	Flandrian	Aquifer
mea	120	Marine or Estuarine alluvium	MEA	SZC	sand silt and clay	Holocene	Aquitard
lde	130	Lacustrine deposits	LDE	CZ	clay and silt	Holocene	Aquitard
rtdu	160	River terrace deposits undifferentiated	RTDU	SV	sand and gravel	Holocene	Aquifer
peat2	170	Lower Peat	PEAT2	P	Organic peat	Holocene	Aquitard
alv2	180	Holocene alluvial gorge fill	ALV2	CZSV	alluvial gorge fill	Holocene	Aquifer
tssg	200	Teeside Sand and Gravel Formation	TSSG	SV	marginal sand and sand and gravel	Devensian	Aquifer
tsdc	210	Teeside Clay Formation	TSDC	CZ	laminated clay Glacio‐lacustrine	Devensian	Aquitard
gfdu1	230	Glaciofluvial deposits‐upper	GFDU1	SV	sand and gravel Glacio‐fluvial	Devensian	Aquifer
hnti	300	Horden Till Formation	HNTI	DMTN	red‐brown diamiction	Devensian	Aquitard
clay_sub_till	335	Sub‐Horden Till laminated clay	GLLD	C	laminated clay Glacio‐lacustrine	Devensian	Aquitard
gfdu2	340	Glaciofluvial deposits‐middle	GFDU2	SV	sand and gravel Glacio‐fluvial	Devensian	Aquifer
dctf	350	Darlington Clay Formation	DTCF	CZ	laminated clay Glacio‐lacustrine	Devensian	Aquitard
gfdu3	370	Glaciofluvial deposits‐lower	GFDU3	SV	sand and gravel Glacio‐fluvial	Devensian	Aquifer
bhti	380	Blackhall Till Formation	BHTI	DMTN	grey to dark brown diamicton	Devensian	Aquitard
sagr	410	Basal sand and gravel	SAGR	SV	Sand or sand and gravel	Devensian	Aquifer
base model	510	Model base	base model	NULL	Model base	None	Aquifer

Surface water, including the River Tees, offshore areas and parts of the Tees Estuary that fall within the model area have been modelled as a pseudo-stratigraphic unit. Information on the geometry of the water bodies, including water depth was taken from OS topographic maps and Hydrographic Office Nautical Charts.

Made ground, including artificial man-made ground observed in boreholes and inferred from features recorded on topographic maps, has been included in the model.

A ‘Base Model’ surface has been modelled to define the lower limit of the modelled ground. This surface lies well below the base of the superficial deposits but does not include details of the bedrock geology.

Also included in the model are several Sand, Sand and Gravel, Till, Peat and Clay lenses found within various units but the majority occur within the Till sequences.