| Computer Code: |
BGD |
Preferred Map Code: |
Bgd |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Rheomorphic, parataxitic tuff, rhyolitic in composition and locally autobrecciated. At top coarse breccia largely composed of clasts of tuff. |
| Definition of Lower Boundary: |
Not exposed, but taken at the base of the parataxitic silicic tuff resting on dominantly lithic-rich lithic-tuff of the Lowcray Formation. |
| Definition of Upper Boundary: |
Not exposed, removed by recent erosion (overlain unconformably by Permian strata). |
| Thickness: |
Estimated minimum preserved thickness c.250m |
| Geographical Limits: |
Main exposures in Blengdale Forest to Ponsonby Fell, near Gosforth, Cumbria. |
| Parent Unit: |
Borrowdale Volcanic Group (BVG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Blengdale Forest. Small quarries exposed north west side of forestry track, c.220m, south west of Gait Kirk, Blengdale Forest, near Gosforth, West Cumbria. |
| Reference Section |
Ponsonby Fell. Small exposures on north west flanks of Ponsonby Fell, c.600m, east north east of Farmery, Gosforth area, West Cumbria. |
| Reference(s): |
| none recorded or not applicable |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E037
|
