| Computer Code: |
TIS |
Preferred Map Code: |
TIS |
| Status Code: |
Pending Upgrade |
| Age range: |
Lochkovian Age (DO)
— Pragian Age (DP) |
| Lithological Description: |
Red, friable sandstone with conglomerate bands and thin intercalated lava flows. |
| Definition of Lower Boundary: |
Change from siltstone to sandstone. |
| Definition of Upper Boundary: |
Transitional, marked by incoming of rhythmically graded siltstone/sandstone units, disappearance of conglomerate bands, and lightening of colour. |
| Thickness: |
250 metres at type section (possibly incomplete due to faulting); increases southwards to approx. 1400 metres around Kildrummy Castle (NJ 455 164); decreases northwards to approx. 100 metres near Boghead (NJ 521 278). |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
Rhynie Group (RHN)
|
| Previous Name(s): |
Tillybrachty Sandstones [Obsolete Name and Code: Use TIS]
(-1233)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Craigs of Tillybrachty, 1:50,000 Sheet 76W, Scotland. |
| Reference(s): |
| Wilson, J S G. 1890. Explanation of Sheet 76 Central Aberdeenshire. Memoir of the Geological Survey (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S076
S086
|
