| Computer Code: |
TURK |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Arundian Substage (CJ)
— Arundian Substage (CJ) |
| Lithological Description: |
Limestone, typically an ooidal and bioclastic grainstone, with rare claystone partings, dolomitic, grey, stylolitic, well-sorted, fossiliferous, relict cross-bedding, wave ripples and hummocky cross-bedding. Interpreted as a transgressive, high energy, shallow marine facies deposited on a carbonate ramp. |
| Definition of Lower Boundary: |
The base of the Turkeyland Member is poorly defined. It rests directly on conglomerates of the Langness Conglomerate Formation on the foreshore of the Langness Peninsula [SC 2820 6607] although exposures are discontinuous and poorly exposed. It was formerly exposed at the now infilled Turkeyland Quarry [SC 2950 6940] where it was recorded by Dickson et al. (1987) as resting directly on conglomerates of the Langness Conglomerate Formation. |
| Definition of Upper Boundary: |
In the field the top of the Turkeyland Member is poorly exposed on the foreshore at Derbyhaven [SC 2835 6653] where it is overlain by the Sandwick Member. The boundary is gradational, taken at the change from limestone(Turkeyland Member) to limestone with interbedded claystones (Sandwick Member). |
| Thickness: |
18 to 25m. |
| Geographical Limits: |
Southern part of the Isle of Man, to the south-east of Castletown, from Derbyhaven [SC 2907 6806] to Creg Inneen Thalleyr [SC 2804 6595]. |
| Parent Unit: |
Derbyhaven Formation (DBH)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Natural foreshore exposures between Derbyhaven and Langness Point: specifically 1km north-west of Langness Point, at a point marked on the 50K OS map as Creg Inneen Thalleyr. These represent discontinuous exposures through the entire thickness of the member. Chadwick et al.(2001) |
| Reference(s): |
| Chadwick, R A, Jackson, D I, Barnes, R P, Kimbell, G S, Johnson, H, Chiverell, R C, Thomas, G S P, Jones, N S, Riley, N J, Pickett, E A, Young, B, Holliday, D W, Ball, D F, Molyneux, S G, Long, D, Power, G M and Roberts, D H. 2001. Geology of the Isle of Man and its offshore area. British Geological Survey Research Report, RR/01/06. |
| Lamplugh G W. 1903. The geology of the Isle of Man. Memoir Geological Survey of Great Britain. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E400
|
