| Computer Code: |
LYS |
Preferred Map Code: |
LyS |
| Status Code: |
Full |
| Age range: |
Holkerian Substage (CQ)
— Asbian Substage (CR) |
| Lithological Description: |
Orange-brown, fine- to coarse-grained sandstone, locally pebbly, with subordinate mudstones. |
| Definition of Lower Boundary: |
The lower boundary is taken at the base of sandstone, resting unconformably on, and overstepping, limestone (Jackie Parr Limestone Formation), and mudstone and sandstone (Silurian and Cambrian strata). |
| Definition of Upper Boundary: |
The upper boundary is taken at the base of calcreted limestones of the overlying Sylvan Limestone Formation. |
| Thickness: |
c.20 to 37m in the Lilleshall [SJ7315] and Coalbrookdale [SJ6408] areas. |
| Geographical Limits: |
Coalbrookdale [SJ 64083]; Lilleshall [SJ 7315]. |
| Parent Unit: |
Peak Limestone Group (PKLM)
|
| Previous Name(s): |
Lydebrook Sandstone [Obsolete Name and Code: Use LYS]
(-4176)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Disused building stone quarries and natural waterfalls in Lydebrook Dingle [SJ 6506]. |
| Reference Section |
Lilleshall Borehole L18 (SJ71NW/64), 37.00 - 61.51m below ground level. |
| Reference(s): |
| 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.). |
| Hamblin, R J O and Coppack, B C, 1995. Geology of Telford and the Coalbrookdale Coalfield. Memoir of the British Geological Survey, parts of Sheets 152 and 153 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E153
|
