| Computer Code: |
RT |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Ediacaran Period (AD)
— Ediacaran Period (AD) |
| Lithological Description: |
Pink, brown, purple and green, tuffaceous mudstones, siltstones and sandstones, with beds of fine-grained lithic felsic tuff. |
| Definition of Lower Boundary: |
Faulted. |
| Definition of Upper Boundary: |
Uncertain. Considered by Greig et al (1968) to be an unconformity, but Cobbold and Whittard (1935) and Pauley (1991) suggested a conformable contact with the Helmeth Grits, based on lithological similarities with the latter. |
| Thickness: |
More than 450m |
| Geographical Limits: |
Welsh Borderlands, Shropshire, Church Stretton area. |
| Parent Unit: |
Stretton Group (YST)
|
| Previous Name(s): |
Ragleth Tuffs [Obsolete Name And Code: Use RT]
(URT)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Southern ridge of Caer Caradoc Hill, Church Stretton. Greig, D C et al. 1968. |
| Reference Section |
Three Fingers Rock, southern spur of Caer Caradoc Hill, 1km northwest of Church Stretton. Greig, D C et al. 1968. |
| Reference(s): |
| Cobbold, E S, and Whittard, W F. 1935. The Helmeth Grits of the Caradoc Range, Church Stretton; their bearing on part of the Pre-Cambrian succession of Shropshire. Proceedings of the Geologists' Association, Vol. 46, 348-359. |
| Greig D C, Wright, J E, Hains, B A, and Mitchell, G H. 1968. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Memoir of the Geological Survey, Sheet 166 (England and Wales). (London: HMSO.) 379pp. |
| Pauley J C. 1991. A revision of the stratigraphy of the Longmyndian Supergroup, Welsh Borderland, and of its relationship to the Uriconian volcanic complex. Geological Journal, Vol. 26, 167-183. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
