| Computer Code: |
RIDCO |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Kimmeridgian Age (JD)
— Berriasian Age (KR) |
| Lithological Description: |
The Ridge Conglomerate Unit consists of dark grey, fine grained, calcareous, micaceous sandstone with grey, angular to rounded, pebble to boulder-sized clasts of Devonian sandstone, shale and Lewisian crystalline basement (e.g. Haszeldine et al., 1987). |
| Definition of Lower Boundary: |
The transition between the Ridge Conglomerate Unit and the underlying Kimmeridge Clay Formation mudstones is represented by a marked downward increase in gamma-ray log values and a decrease in velocity. |
| Definition of Upper Boundary: |
On wireline logs, the top of the unit is marked by a downward decrease in gamma-ray log values and an increase in velocity, as typical Kimmeridge Clay Formation mudstones grade to sandstones, conglomerates and breccias. |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Only recognised within well 206/5-1 in the Faeroe-Shetland Basin. |
| Parent Unit: |
Kimmeridge Clay Formation (KC)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
North Sea well 206/05- 1: 3210-3274 m (10531-10741 ft) (Ritchie et al., 1996). |
| Reference(s): |
| Ritchie, J D, Gatliff, R W and Riding, J, 1996. 1. Pre - Tertiary lithostratigraphy. In: Stratigraphic Nomenclature of the UK North West Margin. British Geological Survey, Nottingham. |
| Haszeldine, R S, Ritchie, J D, and Hitchen, K. 1987. Seismic and well evidence for the early development of the Faeroe-Shetland Basin. Scottish Journal of Geology, 23, 283-300. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
