| Computer Code: |
TRA |
Preferred Map Code: |
TRA |
| Status Code: |
Full |
| Age range: |
Abereiddian Stage (O2)
— Caradoc Series (O4) |
| Lithological Description: |
Red-purple sandstones, mudstones and conglomerates with high magnetic susceptibility. |
| Definition of Lower Boundary: |
Faulted contacts. |
| Definition of Upper Boundary: |
Faulted contacts. |
| Thickness: |
Up to about 1200 m thick. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
Tappins Group (TAP)
|
| Previous Name(s): |
Traboyack Division
(-580)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Traboyack, Sheet S008W. |
| Reference(s): |
| Williams, A, 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. Memoir of the Geological Society of London, No.3. |
| Floyd, J D. 1996. Lithostratigraphy of the Ordovician rocks in the Southern Uplands: Crawford Group, Moffat Shale Group, Leadhills Supergroup. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol. 86, 153-165. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S008
S007
|
