| Computer Code: |
CMI |
Preferred Map Code: |
CMi |
| Status Code: |
Index Level |
| Age range: |
Arnsbergian Substage (CG)
— Arnsbergian Substage (CG) |
| Lithological Description: |
A medium-bedded, brownish grey, fine- to medium-grained, turbiditic sandstone. |
| Definition of Lower Boundary: |
Sharp upward change in a conformable sucession from predominantly grey siltstone to sandstone - base of first sandstone bed above the Brennand Grit. |
| Definition of Upper Boundary: |
Sharp upward change in a conformable sucession from sandstone to predominatly siltstone - top of last sandstone below the Long Bridge Sandstone. |
| Thickness: |
0 to 10m |
| Geographical Limits: |
Abbeystead Forest [SD 5500 5400] southeast of Lancaster. |
| Parent Unit: |
Roeburndale Member (RBL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Section in Cam Brook, a tributary of the River Wyre, 1.5km southwest of Abbeystead, Lancashire; top and base seen. Aitkenhead and others, 1992. |
| Reference(s): |
| Aitkenhead, N, Bridge, D M, Riley, N J, and Kimbell, S F. 1992. Geology of the country around Garstang. Memoir of the British Geological Survey, Sheet 67 (England and Wales) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E067
E059
|
