| Computer Code: |
MYTB |
Preferred Map Code: |
MyTB |
| Status Code: |
Full |
| Age range: |
Bolsovian Substage (CC)
— Asturian Substage (CAS) |
| Lithological Description: |
A thick heterogeneous, dominantly red succession of purple-red mudstone, with subsidiary sandstone and siltstone, and minor 'marl', thin coals and thin beds of limestone with Spirobis sp.
The member was deposited in interdistributary bay or lacustrine environments with minor river channels (Akhurst et al., 1997). The reddening was either primary or early diagenetic.
Bolsovian (Westphalian C) to Asturian (Westphalian D). |
| Definition of Lower Boundary: |
The base of the unit is the top of the highest major channel sandstone unit in the Bransty Cliff Sandstone Member. |
| Definition of Upper Boundary: |
The upper boundary of the member is the sub-Permian unconformity, which is overlain by the coarse, poorly bedded, poorly to moderately sorted, generally massive, matrix or clast-supported, typically pebble-grade, breccias of the Permian Brockram (Appleby Group). |
| Thickness: |
Up to 180 m maximum. |
| Geographical Limits: |
West Cumbria Coalfield. |
| Parent Unit: |
Whitehaven Sandstone Formation (WS)
|
| Previous Name(s): |
Millyeat Beds Member [Obsolete Name and Code: Use MYTB]
(-3572)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Frizington Hall Borehole, NY01NW/174 from 12.8 m to 155 m depth. |
| Reference Section |
Millyeat Borehole, NY01NW/175 from about 7.5 to 158 m depth. |
| Reference(s): |
| Akhurst, M C, Chadwick, R A, Holliday, D W, McCormac, M, McMillan, A A, Millward, D, Young, B, Ambrose, K, Auton, C A, Barclay, W J, Barnes, R P, Beddoe-Stephens, B, James, J C W, Johnson, H, Jones, N S, Glover, B W, Hawkins, M P, Kimbell, G S, MacPherson, K A T, Merritt, J W, Milodowski, A E, Riley, N J, Robins, N S, Stone, P, and Wingfield, R T R. 1997. The geology of the west Cumbria district. Memoir of the British Geological Survey, Sheets 28, 37 and 47 (England and Wales). 138pp. |
| Brockbank, W. 1891. On the occurrence of the Permian, Spirorbis limestones, and Upper Coal Measures at Frizington Hall in the Whitehaven district. Memoir of the proceedings of the Manchester Literary and Philosophical Society, Vol. 4, 418-426. |
| Jones, N S. 1993. Stratigraphical and sedimentological characteristics of the 'Whitehaven Sandstone Series', Westphalian C, West Cumbria coalfield. British Geological Survey Technical Report WH93/102/R. |
| Eastwood, T, Dixon, E E L, Hollingworth, S E, and Smith, B. 1931. The geology of the Whitehaven and Workington District. Memoir of the Geological Survey of Great Britain, Sheet 28 (England and Wales). |
| Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E029
E028
|
