The BGS Lexicon of Named Rock Units — Result Details
Ballycastle Chalk Formation
Computer Code: | BCCK | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Maastrichtian Age (KM) — Maastrichtian Age (KM) | ||
Lithological Description: | Limestone (chalk) with nodular flint bands that have a carious habit in the upper part of the formation. Divided into seven "Beds" (A to G). | ||
Definition of Lower Boundary: | The lower boundary is conformable on the Port Calliagh Chalk Formation at a prominent weathered-out bedding plane at the top of "Bed" F of that lower formation and characterized by tabulate flints. | ||
Definition of Upper Boundary: | The upper boundary is at the erosional contact with Palaeogene Basalts or Quaternary deposits. | ||
Thickness: | 13.72m at the type-site. | ||
Geographical Limits: | Northern Ireland. Limited to the Ballymagarry and Ballycastle areas by the effects of pre-Palaeogene erosion. Ballymagarry Quarry, Castle Point Quarry and cliffs and foreshore eastward to Ballycastle. | ||
Parent Unit: | Ulster White Limestone Group (UWLF) | ||
Previous Name(s): | Ballycastle White Limestone (upper part) [Obsolete Name and Code: Use BCCK]
(-2582)
Ballycastle Chalk Member [Obsolete Name and Code: Use BCCK] (-4444) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | West of Ballycastle Pier. Full formation visible in cliffs and wave-cut platform to the west of the pier. | ||
Reference(s): | |||
Fletcher, T P. 1967. Correlation of the Cretaceous exposures of east Antrim. Unpublished MSc Thesis, Queens University, Belfast. | |||
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. 1977. Lithostratigraphy of the Chalk (Ulster White Limestone Formation) in Northern Ireland. Report of the Institute of Geological Sciences, No. 77/24. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |