Computer Code: |
DPD |
Preferred Map Code: |
DPD |
Status Code: |
Full |
Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
Lithological Description: |
Massive bedded units of volcaniclastic sandstone with intercalations of pebbly sandstone, breccia (both also volcaniclastic), tuff and lapilli-tuff. Includes the St Sunday Crag Member - lapilli-tuff. |
Definition of Lower Boundary: |
Base of lowest sandstone, pebbly sandstone or tuff rests unconformably on the Helvellyn Tuff Formation, but locally there is overstep onto the Middle Dudd and Esk Pike Formations. |
Definition of Upper Boundary: |
Overlying strata not preserved. |
Thickness: |
650m + |
Geographical Limits: |
Grisedale, Deepdale and Dovedale, including Helvellyn and Fairfield, northeast Lake District, Cumbria. |
Parent Unit: |
Borrowdale Volcanic Group (BVG)
|
Previous Name(s): |
Deepdale Formation [Obsolete Name and Code: Use DPD]
(-4619)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
St Sunday Crag, Grisedale. |
Type Section |
Crags between Mart Crag, where the base of the formation is exposed, to Hart Crag, Deepdale. |
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
E030
|