| Computer Code: |
BFLS |
Preferred Map Code: |
BFL |
| Status Code: |
Full |
| Age range: |
Silurian Period (S)
— Devonian Period (D) |
| Lithological Description: |
[Obsolete: use CHAP] Rubbly, massive to nodular limestone-calcrete palaeosol horizons. |
| Definition of Lower Boundary: |
Placed at base of thick mature calcrete, overlying red mudstones. |
| Definition of Upper Boundary: |
Placed at top of thick mature calcrete, above which sandstones of the overlying St.Maughans Formation appear. |
| Thickness: |
2 - 5m, locally up to 8m. |
| Geographical Limits: |
Hereford-Worcester-Tewkesbury districts, but may equate with 'Psammosteus' Limestone(s) present throughout Wales and the Welsh Borderland. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Psammosteus Limestone [Obsolete Name And Code: Use BFLS]
(PSL)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Village of Bishop's Frome, Herefordshire. |
| Reference(s): |
| Barclay, W J, Davies, J R, Hillier, R D, and Waters, R A. 2015. Lithostratigraphy of the Old Red Sandstone successions of the Anglo-Welsh Basin. British Geological Survey Research Report, RR/14/02. 96pp. |
| Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E198
E216
E263
E199
E214
|
