Computer Code: |
HAWT |
Preferred Map Code: |
Hawt |
Status Code: |
Full |
Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
Lithological Description: |
Bedded volcaniclastic siltstones and sandstones with intercalated silicic crystal and vitric tuffs |
Definition of Lower Boundary: |
Taken at the base of the sequence of bedded volcaniclastic rocks resting on densely welded rhyolitic tuff of the Knock Pike Tuff Formation. The basal beds contain fragments of the underlying Knock Pike Tuff |
Definition of Upper Boundary: |
Defined by the base of the unconfomably overlying sedimentary rocks of the Dufton Shale Formation |
Thickness: |
About 300m |
Geographical Limits: |
Restricted to the Cross Fell Inlier, Cumbria |
Parent Unit: |
Borrowdale Volcanic Group (BVG)
|
Previous Name(s): |
Harthwaite Formation [Obsolete Name and Code: Use HAWT]
(-3456)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Partial Type Section |
Harthwaite Sike, Cross Fell, Cumbria Burgess and Holliday, 1979 |
Reference Section |
Small quarry on Dod Hill, Cross Fell, Cumbria Burgess and Holliday, 1979 |
Reference(s): |
Burgess, I C, and Holliday, D W. 1979. Geology of the country around Brough-under-Stainmore. Memoir for 1:50 000 geological sheet 31 and parts of sheets 25 and 30. Geological Survey of Great Britain (England and Wales). (London: HMSO.) 131 pp. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E024
E030
E031
|