Computer Code: |
SSC |
Preferred Map Code: |
SSC |
Status Code: |
Full |
Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
Lithological Description: |
Dacitic ignimbrite in the form of lapilli-tuff, mostly with a eutaxitic foliation due to welding, and with bedded tuffs at the base and top (some with accretionary lapilli, top only) which represent pyroclastic fall and surge deposits. |
Definition of Lower Boundary: |
Basal bedded tuffs are conformable on sandstone of the Deepdale Sandstone Formation. |
Definition of Upper Boundary: |
Bedded tuffs are overlain by andesite - probably a sill. |
Thickness: |
Typically 45-55m |
Geographical Limits: |
St Sunday Crag, Bannerside, Gavel Pike, Lord's Seat, Coldcove and adjacent to Trough Head, all in northeastern Lake District, Cumbria. |
Parent Unit: |
Deepdale Sandstone Formation (DPD)
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Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
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Stratotypes: |
Reference Section |
Crags on south side of Lord's Seat, Deepdale (north side). |
Reference Section |
Top of crags that form St Sunday Crag. Crags are north facing and lie between Grisedale (north) and Deepdale (south). |
Reference(s): |
Woodhall, D G, 1998. The geology of the Wythburn, Thirlmere and Fairfield areas of the north-east Lake District. British Geological Survey Technical Report WA/98/07. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E029
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