Northern Ireland Chalk nomenclature (Ulster Cretaceous Province) - Ulster White Limestone Group: Post-Larry Bane Chalk Subgroup: Port Calliagh Chalk Formation: Difference between revisions
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Name | Name | ||
The Port Calliagh Chalk Member was first proposed in Fletcher (1977) and adopted in BGS publications subsequently. It is regarded as a formation herein. | The Port Calliagh 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 | ||
Port Calliagh [D 112 420] inlet west of Castle Point near Ballycastle, north Antrim and to the east under Castle Point. | Port Calliagh [D 112 420] inlet west of Castle Point near Ballycastle, north Antrim and to the east under Castle Point. | ||
Primary Reference Section | Primary Reference Section | ||
Ballymagarry Quarry and around Ballycastle Harbour in the North Antrim Basin, in three quarries on the western Londonderry Shelf region, at Whiterock in Belfast and in Small and Hayes Quarry north-east of Lurgan. | Ballymagarry Quarry and around Ballycastle Harbour in the North Antrim Basin, in three quarries on the western Londonderry Shelf region, at Whiterock in Belfast and in Small and Hayes Quarry north-east of Lurgan. | ||
Formal subdivision | Formal subdivision | ||
None but informally divided into units A to F from the base. | None but informally divided into units A to F from the base. | ||
Lithology | Lithology | ||
Limestone (chalk) with numerous flint bands displaying large, tabular and complex habit. | Limestone (chalk) with numerous flint bands displaying large, tabular and complex habit. | ||
Definition of upper boundary | Definition of upper boundary | ||
Conformable at a prominent weathered-out bedding plane at the top of ‘Bed’ F with the Ballycastle Chalk Formation, | Conformable at a prominent weathered-out bedding plane at the top of ‘Bed’ F with the Ballycastle Chalk Formation, | ||
Definition of lower boundary | Definition of lower boundary | ||
Conformable on the Tanderagee Chalk Formation at the lowest ‘separation plane’ immediately beneath the ‘belt of complex flints’ seen in the Ballycastle section. | Conformable on the Tanderagee Chalk Formation at the lowest ‘separation plane’ immediately beneath the ‘belt of complex flints’ seen in the Ballycastle section. | ||
Thickness | Thickness | ||
12.40m at the type-site. | 12.40m at the type-site. | ||
Distribution | Distribution | ||
Outcrops 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. | Outcrops 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. | ||
Previous names | Previous names | ||
Port Calliagh Chalk Member. | Port Calliagh Chalk Member. | ||
Forms the lower part of the Ballycastle White Limestone (Wood, 1967). | Forms the lower part of the Ballycastle White Limestone (Wood, 1967). | ||
Parent | Parent | ||
Ulster White Limestone Group. | Ulster White Limestone Group. | ||
Age and biostratigraphy | Age and biostratigraphy | ||
Upper Cretaceous, Maastrichtian. Belemnella lanceolata Zone. | Upper Cretaceous, Maastrichtian. Belemnella lanceolata 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 | 07]] | [[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Ulster_White_Limestone_Group:_Post-Larry_Bane_Chalk_Subgroup | 07]] | ||
Revision as of 14:26, 10 February 2014
Name The Port Calliagh Chalk Member was first proposed in Fletcher (1977) and adopted in BGS publications subsequently. It is regarded as a formation herein.
Type section Port Calliagh [D 112 420] inlet west of Castle Point near Ballycastle, north Antrim and to the east under Castle Point.
Primary Reference Section Ballymagarry Quarry and around Ballycastle Harbour in the North Antrim Basin, in three quarries on the western Londonderry Shelf region, at Whiterock in Belfast and in Small and Hayes Quarry north-east of Lurgan.
Formal subdivision None but informally divided into units A to F from the base.
Lithology Limestone (chalk) with numerous flint bands displaying large, tabular and complex habit.
Definition of upper boundary Conformable at a prominent weathered-out bedding plane at the top of ‘Bed’ F with the Ballycastle Chalk Formation,
Definition of lower boundary Conformable on the Tanderagee Chalk Formation at the lowest ‘separation plane’ immediately beneath the ‘belt of complex flints’ seen in the Ballycastle section.
Thickness 12.40m at the type-site.
Distribution Outcrops 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.
Previous names Port Calliagh Chalk Member.
Forms the lower part of the Ballycastle White Limestone (Wood, 1967).
Parent Ulster White Limestone Group.
Age and biostratigraphy Upper Cretaceous, Maastrichtian. Belemnella lanceolata Zone.
References Fletcher (1967, 1977).