Northern Ireland Chalk nomenclature (Ulster Cretaceous Province) - Ulster White Limestone Group: Post-Larry Bane Chalk Subgroup: Ballycastle Chalk Formation: Difference between revisions
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Name | =====Name===== | ||
The Ballycastle Chalk Member was first proposed in Fletcher (1977) and adopted in BGS publications subsequently. It is regarded as a formation herein. | The Ballycastle Chalk Member was first proposed in Fletcher (1977) and adopted in BGS publications subsequently. It is regarded as a formation herein. | ||
=====Type section===== | |||
Type section | |||
West of Ballycastle Pier [D 120 415]. | West of Ballycastle Pier [D 120 415]. | ||
=====Primary Reference Section===== | |||
Primary Reference Section | |||
Ballymagarry Quarry, Castle Point Quarry and cliffs and foreshore eastward to Ballycastle. | Ballymagarry Quarry, Castle Point Quarry and cliffs and foreshore eastward to Ballycastle. | ||
=====Formal subdivision===== | |||
Formal subdivision | |||
None but informally divided into units A to G from the base. | None but informally divided into units A to G from the base. | ||
=====Lithology===== | |||
Lithology | |||
Limestone (chalk) with nodular flint bands which have a carious habit in the upper part of the formation. Divided into seven ‘Beds’ (A to G). | Limestone (chalk) with nodular flint bands which have a carious habit in the upper part of the formation. Divided into seven ‘Beds’ (A to G). | ||
=====Definition of upper boundary===== | |||
Definition of upper boundary | |||
Erosional contact with Palaeogene Basalts or Quaternary deposit. | Erosional contact with Palaeogene Basalts or Quaternary deposit. | ||
=====Definition of lower boundary===== | |||
Definition of lower boundary | |||
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 characterised by tabulate flints. | 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 characterised by tabulate flints. | ||
=====Thickness===== | |||
Thickness | |||
13.72m at type-site. | 13.72m at type-site. | ||
=====Distribution===== | |||
Distribution | |||
Limited to the Ballymagarry and Ballycastle areas by pre-Palaeogene erosion | Limited to the Ballymagarry and Ballycastle areas by pre-Palaeogene erosion | ||
=====Previous names===== | |||
Previous names | |||
Forms the upper part of the Ballycastle White Limestone of Wood (1967). | Forms the upper part of the Ballycastle White Limestone of Wood (1967). | ||
Ballycastle Chalk Member. | Ballycastle Chalk Member. | ||
=====Parent===== | |||
Parent | |||
Ulster White Limestone Group. | Ulster White Limestone Group. | ||
=====Age and biostratigraphy===== | |||
Age and biostratigraphy | |||
Upper Cretaceous, Maastrichtian. Belemnella occidentalis Zone. | Upper Cretaceous, Maastrichtian. Belemnella occidentalis Zone. | ||
=====References===== | |||
References | |||
Fletcher (1967, 1977). | Fletcher (1967, 1977). | ||
[[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Ulster_White_Limestone_Group:_Post-Larry_Bane_Chalk_Subgroup | 08]] | [[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Ulster_White_Limestone_Group:_Post-Larry_Bane_Chalk_Subgroup | 08]] | ||
Revision as of 14:28, 10 February 2014
Name
The Ballycastle Chalk Member was first proposed in Fletcher (1977) and adopted in BGS publications subsequently. It is regarded as a formation herein.
Type section
West of Ballycastle Pier [D 120 415].
Primary Reference Section
Ballymagarry Quarry, Castle Point Quarry and cliffs and foreshore eastward to Ballycastle.
Formal subdivision
None but informally divided into units A to G from the base.
Lithology
Limestone (chalk) with nodular flint bands which have a carious habit in the upper part of the formation. Divided into seven ‘Beds’ (A to G).
Definition of upper boundary
Erosional contact with Palaeogene Basalts or Quaternary deposit.
Definition of lower boundary
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 characterised by tabulate flints.
Thickness
13.72m at type-site.
Distribution
Limited to the Ballymagarry and Ballycastle areas by pre-Palaeogene erosion
Previous names
Forms the upper part of the Ballycastle White Limestone of Wood (1967).
Ballycastle Chalk Member.
Parent
Ulster White Limestone Group.
Age and biostratigraphy
Upper Cretaceous, Maastrichtian. Belemnella occidentalis Zone.
References
Fletcher (1967, 1977).