Computer Code: |
CGWD |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
Lithological Description: |
Clast-supported, poorly sorted gravel with lenses of sand. Clasts are mainly subangular to rounded, up to cobble size and composed of red (Permo-Triassic) and yellow (Carboniferous) sandstones, and coal. |
Definition of Lower Boundary: |
Sharp erosional contact on diamictons of the Low Wath Till Member. |
Definition of Upper Boundary: |
At the type section conformably overlain by silt and clay of the Ehen Valley Silt Member of the Seascale Glacigenic Formation. |
Thickness: |
1.2m thick at type section but up to 10m thick in boreholes around Egremont. |
Geographical Limits: |
1:50k sheets 37 Gosforth and 38 Whiteheaven, Western Cumbria. |
Parent Unit: |
Seascale Glacigenic Formation (SEAG)
|
Previous Name(s): |
Middle Sands and Gravels [Obsolete Name and Code: Use GFSA, SEAG, CGWD, LOGG, PLSG, PFS, EVSI, THBG, EVSG]
(-122)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
'Rothersyke Scar' river cliff section, western side of River Ehen, west Cumbria, between Rothersyke House and Low Mill; c.300m west of Thornhill village. Nirex Science Report SA/97/045 (Issue 2.0). 1997 |
Reference Section |
River cliff section at Low Wath, c.200m southeast of Cleator Moor, west Cumbria. BGS Nirex log NY01SW ME4). Nirex Science Report 768 (1995). |
Reference(s): |
Merritt, J W and Auton, C A. 1997. Quaternary lithostratigraphy of the Sellafield district. Nirex Science Report SA/97/045 (Issue 2.0). [Report prepared for UK Nirex Ltd. 69pp, 5 tables, 20 figures, 14 enclosures and one appendix.] |
Merritt, J W, Auton, C A, Browne, M A E, Neilson, G and McMillan, A A. 1995. Characterisation of the onshore Quaternary deposits around Sellafield, Cumbria, Phase II. Nirex Science Report 768. |
Eastwood T, and others. 1968. Geology of the country around Whitehaven. Memoir of the Geological Survey of Great Britain, Sheet 28 (England and Wales). |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |