| Computer Code: |
HWK |
Preferred Map Code: |
HWK |
| Status Code: |
Full |
| Age range: |
Llandovery Epoch (SL)
— Wenlock Epoch (SW) |
| Lithological Description: |
Thin- to medium-bedded greywacke and interbedded silty mudstone with thin red mudstone beds in Carghidown Formation and laminated fossiliferous carbonaceous siltstone beds in Ross Formation. Greywackes calcareous except in Cairnharrow Formation. |
| Definition of Lower Boundary: |
Faulted - base gradational through Cairnharrow Formation to Gala Group. |
| Definition of Upper Boundary: |
Faulted - top gradational through Ross Formation to Riccarton Group. |
| Thickness: |
Unknown, possibly up to several km thick. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Hawick Rocks [Obsolete Name and Code: Use ETRK, EKM, GDE, HWK]
(-3383)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Webb, B C, Rushton, A W A and White, D E. 1993. Moffatdale and the upper Ettrick valley. Description of the solid geology of parts of 1:25000 sheets NT10, 11, 20 and 21. Classical Areas of British Geology. (London: British Geological Survey, HMSO.) |
| White, D E, Barron, H F, Barnes, R P and Lintern, B C. 1991. Biostratigraphy of late Llandovery (Telychian) and Wenlock turbiditic sequences in the SW Southern Uplands, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.82, 297-322. |
| Barnes, R P. 1989. Geology of the Whithorn district. Memoirs of the British Geological Survey, 1:50,000 Sheet 2 (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S002
S016
S017
S017
S034
E001
E002
|
