| Computer Code: |
MCSA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Chadian Substage (CI)
— Holkerian Substage (CQ) |
| Lithological Description: |
Medium- to thick-bedded, medium- to coarse-grained, planar and trough cross-bedded sandstone. In places the bedding is disturbed. Some thin mudstone beds towards top and base. Some granule-sized conglomeratic beds. Sandstone consists mainly of sub-rounded quartz grains with some interstitial quartz and calcite cements. |
| Definition of Lower Boundary: |
Contact of sandstone with underlying mudstone and siltstone of the Fell Sandstone Formation (undifferentiated). |
| Definition of Upper Boundary: |
Contact of sandstone with overlying mudstone and siltstone of the Fell Sandstone Formation (undifferentiated). |
| Thickness: |
0 to 60m, with the greatest thickness near Shoreswood Farm [NT 3940 6465]. |
| Geographical Limits: |
In the area southwest of Berwick-upon-Tweed the Fell Sandstone Formation consists of several sandstone members separated by variable thicknesses of mudstone and siltstone. The Murton Crags Sandstone is the upper of three members and crops out in the region of Shoreswood and Thornton in north Northumberland. |
| Parent Unit: |
Fell Sandstone Formation (FELL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
The Murton Crags Sandstone Member is exposed at Murton High Crags, to the southeast of Longridge Towers School. Virtually the full unit is exposed, but the upper and lower contacts are not seen. Hodgson, 1978. |
| Reference Section |
Thornton Mains Borehole: NT94NE 16, between 50 and 90m depth. |
| Reference(s): |
| Hodgson, A V. 1978. Braided river bedforms and related sedimentary structures in the Fell Sandstone Group. (Lower Carboniferous) of north Northumberland. Proceedings of the Yorkshire Geological Society, Vol.41. Part 4. 509-532. |
| Turner, B R, Younger, P L and Fordham, C E. 1993. Fell Sandstone Group lithostratigraphy south-west of Berwick-upon-Tweed: implications for the regional development of the Fell Sandstone. Proceedings of the Yorkshire Geological Society. Vol.49, Part 4, 269-281. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
