| Computer Code: |
RNM |
Preferred Map Code: |
RNM |
| Status Code: |
Full |
| Age range: |
Arenig Series (OR)
— Arenig Series (OR) |
| Lithological Description: |
A series of large sandstone-rich olistoliths ranging in size up to 1km across. Mainly quartz-rich lithic wackes and granule conglomerates interbedded with siltstone amd mudstone. |
| Definition of Lower Boundary: |
The Robinson Member is locally conformable with the underlying Goat Gills Member (breccia) [NY 1895 1624], but the lowest beds are highly disturbed and in Goats Gills [NY 1914 1630] they are truncated against the underlying unit. |
| Definition of Upper Boundary: |
The Robinson Member is surrounded by an envelope of sandstone-rich Buttermere Formation rocks. |
| Thickness: |
250m |
| Geographical Limits: |
Occurs in the south of the Skiddaw inlier within the Buttermere Formation and bounded to the north by the Causey Pike Fault. |
| Parent Unit: |
Buttermere Formation (BUF)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Robinson, east of Buttermere. Cooper et al, 1995 |
| Type Area |
In Littledale, the maximum thickness is exposed but the base is not seen. Cooper et al, 1995 |
| Reference(s): |
| Cooper, A H, Rushton, A W A, Molyneux, S G, Hughes, R A, Moore, R M, and Webb, B C. 1995. The stratigraphy,correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District. Geological Magazine, Vol. 132(2), 185-211. |
| Webb, B C. 1990. The Buttermere Formation (Skiddaw Group) in the Robinson area. 74-82 in Moseley, F (Ed.), The Geology of the Lake District. [The Geologists' Association.] |
| Cooper, D C, Lee, M K, Forty, N J, Cooper, A H, Rundle, C C, Webb, B C, and Allen, P M. 1988. The Crummock Water Aureole: a zone of metasomatism and source of ore metals in the English Lake District. Journal of the Geological Society, Vol. 145(4), 523-540. |
| Webb, B C and Cooper, A H. 1988. Slump folds and gravity slide structures in a Lower Palaeozoic marginal basin sequence (the Skiddaw Group), NW England. Journal of Structural Geology, Vol.10(5), 463-472. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E029
|
