| 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
|
