| Computer Code: |
TYN |
Preferred Map Code: |
TYN |
| Status Code: |
Full |
| Age range: |
Tournaisian Age (CT)
— Tournaisian Age (CT) |
| Lithological Description: |
[Obsolete: use BGN]
Pale sandstones interbedded with grey, green, purple or brown siltstones and mudstones. Bands of dolomite/limestone (cementstone) and nodular carbonate (cornstone) are distributed irregularly through the sequence. |
| Definition of Lower Boundary: |
The base is drawn at the incoming of significant thicknesses of grey mudstone and cementstone in or above a sandstone-cornstone sequence. |
| Definition of Upper Boundary: |
The top is drawn at the incoming of common seatrock, coal, sideritic ironstone, black mudstone or marine bands; or where the sequence becomes dominated by volcanic rocks. |
| Thickness: |
800m estimated in Edinburgh, 384m+ at East Linton; 209m at Birnieknowes and 263m at Spilmersford. |
| Geographical Limits: |
Lothians. Berwickshire. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Cementstone Group [Obsolete Name and Code: Use BGN, TYN, INV]
(*172)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
On the coast at Cockburnspath. |
| Reference Section |
On the coast at West Barns. |
| Reference Section |
On the coast between Tyninghame and North Berwick (Davies et al., 1986; McAdam and Clarkson, 1986). |
| Type Area |
Spilmersford Borehole, NT46SE/73, between 658.72 and 921.71 m depth. |
| Reference(s): |
| Chisholm, J I, MacAdam, A D, Brand, P J. 1989. Lithostratigraphical classification of Upper Devonian and Lower Carboniferous rocks in the Lothians. British Geological Survey Technical Report, WA/89/26. |
| Browne, M A E, Dean, M T, Hall, I H S, McAdam, A D, Monro, S K, and Chisholm, J I. 1996. A lithostratigraphical framework for the Carboniferous rocks of the Midland Valley of Scotland. British Geological Survey Technical Report WA/96/29. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S033
S033
S034
S023
S024
S032
S032
|
