The BGS Lexicon of Named Rock Units — Result Details

Jacket's Point Formation

Computer Code: JAPT Preferred Map Code: JPF
Status Code: Pending Upgrade
Age range: Frasnian Age (DR) — Frasnian Age (DR)
Lithological Description: Grey slaty mudstone with sandstone, conglomerate and associated volcanic rocks.
Definition of Lower Boundary: Believed to be conformable on the Harbour Cove Slate Formation, but faulted.
Definition of Upper Boundary: Not seen, faulted.
Thickness: 100m
Geographical Limits: Port Isaac Bay to St Teath, north Cornwall.
Parent Unit: Not Available (!)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Bound's Cliff and 3km to the north. Selwood, E B, et al, 1986. 
Reference(s):
Selwood, E B and Thomas, J M, 1986. Upper Palaezoic successions and nappe structures in north Cornwall. Journal of the Geological Society of London, Vol.143, 75-82. 
Selwood, E B, Thomas, J M, Williams, B J, Clayton, R, Durning, B, Smith, O and Warr, L N, 1998. Geology of the country around Trevose Head and Camelford. Memoir of the British Geological Survey, sheets 335 and 336 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable