| Computer Code: |
MHSG |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Sandy gravel, yellowish brown with orange staining, with angular to well rounded clasts up to cobble size mainly of yellow, red and white sandstone, black fissile mudstone and coal. Sand mainly coarse-grained with shell fragments. Horizontal to trough cross stratification with palaeocurrent towards the north. Locally passes upwards into granule gravel and sand with 10-15mm thick laminae of silt. |
| Definition of Lower Boundary: |
Sharp, erosional contact on bedrock or very compact, fissile, dusky yellowish brown to dark olive grey, gravelly sandy silty clayey diamicton (lodgement till) containing angular to well-rounded clasts up to cobble size of yellow and white sandstone, dolerite, porphyritic lavas, limestone, coal, greywacke sandstone, 'haggis' rock, vein quartz, jasper, flint, granitic gneiss, numerous shell fragments and metamorphic rock of possible Scandinavian origin (Warren House Till Formation). |
| Definition of Upper Boundary: |
Sharp, planar contact with dark olive grey, very stiff, gravelly sandy silty clayey diamicton with angular well rounded clasts up to boulder size mainly of yellow and white sandstones, greywacke sandstone, porphyritic lava and shell fragments (Blackhall Till Formation?). |
| Thickness: |
To 3m |
| Geographical Limits: |
Northeast England. |
| Parent Unit: |
North Pennine Glacigenic Subgroup (NPEG)
|
| Previous Name(s): |
Basal Gravels [Obsolete Name and Code: Use MHSG]
(-396)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Drift-filled buried valley exposed in former Maiden's Hall opencast coal site, 13km northnortheast of Morpeth, Northumberland. |
| Reference(s): |
| Northeast England. BGS Stratigraphical Framework Report for Quaternary and Neogene deposits of Great Britain. In preparation. |
| Smith, D B. 1981. The Quaternary geology of the Sunderland district, northeast England. 146-167 in Neale, J and Flenley, J (editors), The Quaternary in Britain. [Exeter: Pergamon Press.] 267pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
