| Computer Code: |
POLT |
Preferred Map Code: |
POLT |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Breccia of amygdaloidal lava clasts in a clastic or tuffaceous matrix with intercalations of dark silty mudstone. |
| Definition of Lower Boundary: |
Appearance of lava clasts in sandstone-siltstone succession. |
| Definition of Upper Boundary: |
Last occurrence of lava clasts. |
| Thickness: |
c.40m |
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Kirkcolm Formation (KKF)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
In Poltallan Burn near bend in wall c.300m upstream of junction of Poltallan Burn with Euchan Water. |
| Reference(s): |
| Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. |
| Floyd, J D. 1982. Stratigraphy of a flysch succession: The Ordovician of West Nithsdale, South West Scotland. Transactions of the Royal Society of Edinburgh, Earth Sciences, Vol. 73 (1), 1-9. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S015
S015
|
