| 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: |
| Type Section |
Crags between Mart Crag, where the base of the formation is exposed, to Hart Crag, Deepdale. |
| Reference Section |
St Sunday Crag, Grisedale. |
| 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
|
