The BGS Lexicon of Named Rock Units — Result Details

Pennan Sandstone Formation

Computer Code: PNN Preferred Map Code: PNN
Status Code: Full
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: Red sandstone.
Definition of Lower Boundary: Base of red pebbly sandstone sequence conformably overlying the mixed siltstones and minor sandstones of the Gamrie Bay Sandstone.
Definition of Upper Boundary: Everywhere an unconformity overlain by the middle Devonian Conglomerates of the Inverness Group, i.e. Gardenstown Conglomerate.
Thickness: 300m+
Geographical Limits: Gardenstown - Cuminestown - Sandy Haven at NJ 8592 6553.
Parent Unit: Crovie Sandstone Group (CRO)
Previous Name(s): Bed 4 (-2980)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Beach and cliff section on western side of Gamrie Bay, Gardenstown Old Town. 
Reference(s):
Read, H H, 1923. Geology of the country around Banff, Huntly and Turriff, Lower Banffshire and north-west Aberdeenshire. Memoir of the Geological Survey, Scotland Sheets 86 and 96 (Scotland). 
Trewin, N H, 1987. Permian unconformity within the Old Red Sandstone, localities 2, 3 and 4, p.128-130, fig.2, Bed A; Old Red Sandstone and Dalradian of Gamrie Bay. Locality 10, p.120 in excursion guide to the geology of the Aberdeen area, Trewin, N H, Kneller, B C and Gillen, C (editors). (Edinburgh: Scottish Academic Press). 
Turner, P and Archer, R. 1975. Magnetisation history of Lower Old Red Sandstones from the Gamrie Outlier, Scotland, Earth and Planetary Science Letters, Vol.27, Castle Hill Sandstone, p.242. 
Mykura, W. 1991. Old Red Sandstone. 297-346 in Geology of Scotland (3rd edition, revised). Craig, G Y (editor). Geological Society of London. 
Archer, R, 1978. Crovie Siltstone Formation on p.17, West Harbour Formation on p.35, New Harbour Siltstone Formation on p.81 and Counter Head equivalent section on p.85, The Old Red Sandstone outliers of Gamrie and Rhynie, Aberdeenshire, PhD thesis (University of Newcastle upon Tyne). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S096