| Computer Code: |
LUBR |
Preferred Map Code: |
LuBr |
| Status Code: |
Full |
| Age range: |
Triassic Period (T)
— Triassic Period (T) |
| Lithological Description: |
Breccia, sandy breccia, pebbly sandstone and sandstone, reddish brown, commonly calcareous; calcite-veined in places, and locally well-cemented-clasts in breccias; mainly angular platy slate, shale, sandstone and quartz. Thin unit of conglomerate with rounded boulders of Devonian sandstone. Near base, reddish brown, weakly cemented, silty, fine- to medium-grained sandstone unit, up to 70m. |
| Definition of Lower Boundary: |
Unconformable: rests on Hangman Sandstone (Eifelian). |
| Definition of Upper Boundary: |
Probably unconformable: overlain with probable angular discordance by Mercia Mudstone Group (Triassic). |
| Thickness: |
Up to 650 m. estimated. |
| Geographical Limits: |
Porlock Basin, west Somerset. Sheet 278 (Minehead). |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Luccombe Breccia Series [Obsolete Name and Code: Use LUBR]
(-1671)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Village of Luccombe (SS 911 445), west Somerset. No suitable type section. Small quarries between Luccombe and Tivington. |
| Type Area |
Village of Luccombe. |
| Type Area |
Village of Luccombe. |
| Type Area |
Village of Luccombe. |
| Type Area |
Village of Luccombe. |
| Reference Section |
Basal sandstone in stream section. |
| Reference Section |
Conglomerate in lane section in Huish Ball Steep. |
| Reference(s): |
| Thomas, A N. 1940. The Triassic Rocks of North-west Somerset. Proceedings of the Geologists' Association, Vol.51, 1-43. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
