The BGS Lexicon of Named Rock Units — Result Details

Jurby Formation

Computer Code: JURBY Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Stratigraphically complex glacigenic sequence of local provenance, including laminated and massive muds with dropstones, interstratified gravel sand and mud, and muddy diamicton.
Definition of Lower Boundary: Disconformably overlies diamictons, sands and gravels (that contain exotic clasts) of the Orrisdale Formation. The unit crops out along the northwest coast of the Isle of Man.
Definition of Upper Boundary: Unconformably overlain by peat, organic mud and calcareous marl of the Glen Balleira Formation that infills kettlehole basins.
Thickness: Unrecorded, but diagrams suggest >10m thick.
Geographical Limits: Northern part pf the Isle of Man. (50k sheets 36 and possibly 46).
Parent Unit: Irish Sea Coast Glacigenic Subgroup (ISCG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Coastal cliff section at Jurby Head, c.1km west of the village of Jurby West, on the western side of the Isle of Man. Chadwick, R A et al. 2001. 
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. 
Thomas, G S P. 1999. Northern England. 91-98 in Bowen, D Q (Editor), A revised correlation of Quaternary and Neogene deposits in the British Isles. Geological Society Special Report No.23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: