Computer Code: |
HRG |
Preferred Map Code: |
HRG |
Status Code: |
Full |
Age range: |
Wenlock Epoch (SW)
— Wenlock Epoch (SW) |
Lithological Description: |
[Obsolete: use BKR] Interbedded greywacke, sandstones and siltstones. Underlying and overlying laminated silty mudstone. |
Definition of Lower Boundary: |
Incoming of greywacke, sandstones and siltstones above silty mudstones of Brathay Formation. |
Definition of Upper Boundary: |
By base of overlying Horrace Formation - laminated silty mudstone. |
Thickness: |
c.250 metres. (Lateral variations ~200 = ~300 metres). |
Geographical Limits: |
Not defined. |
Parent Unit: |
none recorded or not applicable
|
Previous Name(s): |
Harlock Grits [Obsolete Name and Code: Use HRG]
(-4713)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Ulverston, Sheet 48. |
Reference(s): |
Rose, W C C. 1977. Geology and Hematite deposits of South Cumbria. Economic Memoir for 1:50,000 Sheet 58 and southern part of Sheet 48. Memoir of the geological Survey of Great Britain. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E048
|