The BGS Lexicon of Named Rock Units — Result Details

Port Calliagh Chalk Formation

Computer Code: PCC Preferred Map Code: notEntered
Status Code: Full
Age range: Maastrichtian Age (KM) — Maastrichtian Age (KM)
Lithological Description: Limestone (chalk) with numerous flint bands displaying large, tabular and complex habit.
Definition of Lower Boundary: The lower boundary is conformable on the Tanderagee Chalk Formation at the lowest "separation plane" immediately beneath the "belt of complex flints" seen in the Ballycastle section.
Definition of Upper Boundary: The upper boundary is conformable at a prominent weathered-out bedding plane at the top of "Bed" F with the Ballycastle Chalk Formation.
Thickness: 12.40m at the type-site.
Geographical Limits: Outcrops in Northern Ireland in the Southern Uplands area (in isolated areas), the North Antrim Basin and in the southern part of the Londonderry Shelf. Absent in the East Antrim Basin, the Highland Border High and northern Londonderry shelf due to pre-Palaeogene erosion.
Parent Unit: Ulster White Limestone Group (UWLF)
Previous Name(s): Port Calliagh Chalk Member (-2359)
Ballycastle White Limestone (Lower Part) (-4244)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Port Calliagh, inlet west of Castle Point near Ballycastle, north Antrim and to the east under Castle Point. Type section in the wave-cut platform at the base of the cliff path. The section can be reliably measured to the east under Castle Point in the core of an anticline. Fletcher (1977). 
Reference(s):
Wood, C J. 1967. Some new observations on the Maastrichtian Stage in the British Isles. Bulletin of the Geological Survey of Great Britain, Vol.27, 271-288. 
Fletcher, T P. 1967. Correlation of the Cretaceous exposures of east Antrim. Unpublished MSc Thesis, Queens University, Belfast. 
Fletcher, T P. 1977. Lithostratigraphy of the Chalk (Ulster White Limestone Formation) in Northern Ireland. Report of the Institute of Geological Sciences, No. 77/24. 
Hopson, P M. 2005. A stratigraphical framework for the Upper Cretaceous Chalk of England and Scotland, with statements on the Chalk of Northern Ireland and the UK Offshore Sector. British Geological Survey Research Report RR/05/01 102pp. ISBN 0 852725175 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable