| Computer Code: |
LCW |
Preferred Map Code: |
LCw |
| Status Code: |
Pending Upgrade |
| Age range: |
Homerian Age (SH)
— Homerian Age (SH) |
| Lithological Description: |
[Obsolete: use BKR] The type area west of Windermere consists of a sequence of thickly bedded, fine-grained sandstones with subordinate, muddy siltstones; the thick sandstones wedge out east of Windermere and show a lateral transition into a facies with a characteristic "striped" appearance consisting of laminae (0.5 mm to 15 mm) and beds of coarse-grained silt in blue-grey silty mudstone of the Brathay Flags type lithology. |
| Definition of Lower Boundary: |
Taken at base of lowest sandstone bed or of "striped facies" above the Brathay Flag Formation. |
| Definition of Upper Boundary: |
Taken at the incoming of calcareous siltstones of the Middle Coldwell Beds. |
| Thickness: |
c.200m at the type section, thins eastwards to less than 10m. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
North-west of Coldwell Quarry, Hawkshead, Cumbria, lower boundary well seen at High Cross Plantation, Sheet 38 (Ambleside). |
| Reference(s): |
| Marr, J E. 1878. On some well defined Life Zones in the lower part of the Silurian (Sedgwick) of the Lake District. Quarterly Journal of the Geological Society, Vol.34, p.871-885. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E039
|
