| Computer Code: |
YWCH |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Ediacaran Period (AD)
— Ediacaran Period (AD) |
| Lithological Description: |
Purple and green micaceous pebbly sandstone and conglomerate containing abundant volcanic and metamorphic pebbles. |
| Definition of Lower Boundary: |
Taken at base of lowermost bed of conglomerate within the Bayston-Oakswood Formation, immediately overlying the purple and grey mudstones of the Portway Formation. Believed to be an unconformable contact by certain authors. |
| Definition of Upper Boundary: |
Taken at the transition into coarse feldspathic sandstones and interbedded thin mudstones of the Bayston-Oakswood Formation. |
| Thickness: |
100 m thick. |
| Geographical Limits: |
Welsh Borderlands, specifically the Shrewsbury Sheet. Appears to pass laterally into the coarse sandstones of the Bayston-Oakswood Formation. |
| Parent Unit: |
Bayston-Oakswood Formation (BAGP)
|
| Previous Name(s): |
Haughmond Conglomerate [Obsolete Name and Code: Use YWCH]
(-1293)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
South-east side of Sharpstone Hill. Pocock R W, et al., 1938. |
| Reference(s): |
| 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. |
| Pocock R W, Whitehead T H, Wedd C B and Robertson T. 1938. Shrewsbury District including the Hanwood Coalfield. Memoir of the Geological Survey of Great Britain, England and Wales. (London: H.M.S.O.). |
| Lapworth C and Watts W W. 1910. Shropshire. 739-769 in Geology in the field; the Jubilee Volume of the Geologists' Association (1858-1908). Monckton H W and Herries R S (editors). (London: Edward Stanford). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E152
|
