Northern Ireland Chalk nomenclature (Ulster Cretaceous Province) - Ulster White Limestone Group: Post-Larry Bane Chalk Subgroup: Tanderagee Chalk Formation: Difference between revisions
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Name | =====Name===== | ||
The Tanderagee Chalk Member was first proposed in Fletcher (1977) and adopted in BGS publications subsequently. It is regarded as a formation herein. | The Tanderagee 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 | |||
Long Gilbert Quarry, Ballymagarry [C 889 407], south wall of western part of quarry. | Long Gilbert Quarry, Ballymagarry [C 889 407], south wall of western part of quarry. | ||
=====Primary Reference Section===== | |||
Primary Reference Section | |||
Numerous in the North Antrim Basin, the southern Londonderry Shelf and in the Southern Uplands. It is seen in sections between Magheralin and Trummery, Groganstown and the ‘Hairpin Bend’ region of Ballysillan, Ballycastle to Ballintoy, Portbraddan to Downhill and between Carmean and Stewartstown. | Numerous in the North Antrim Basin, the southern Londonderry Shelf and in the Southern Uplands. It is seen in sections between Magheralin and Trummery, Groganstown and the ‘Hairpin Bend’ region of Ballysillan, Ballycastle to Ballintoy, Portbraddan to Downhill and between Carmean and Stewartstown. | ||
=====Formal subdivision===== | |||
Formal subdivision | |||
Includes the Long Gilbert Flint Band (of bed status) and informally divided into units A to E from the base. | Includes the Long Gilbert Flint Band (of bed status) and informally divided into units A to E from the base. | ||
=====Lithology===== | |||
Lithology | |||
Limestone (chalk) with flint bands. Divided into five ‘Beds’ (A to E). Abundant belemnites in lower ‘Bed’ A and by an acme of crinoid debris in ‘Bed’ C. Elsewhere asteroid and crinoid debris common. | Limestone (chalk) with flint bands. Divided into five ‘Beds’ (A to E). Abundant belemnites in lower ‘Bed’ A and by an acme of crinoid debris in ‘Bed’ C. Elsewhere asteroid and crinoid debris common. | ||
=====Definition of lower boundary===== | |||
Definition of lower boundary | |||
Conformable, on the Ballymagarry Chalk Formation, at a bedding plane immediately below the thick continuous tabulate Long Gilbert Flint Band where this exists. Or at the same bedding plane marking the faunal change from the Ballymagarry Chalk Formation fauna. | Conformable, on the Ballymagarry Chalk Formation, at a bedding plane immediately below the thick continuous tabulate Long Gilbert Flint Band where this exists. Or at the same bedding plane marking the faunal change from the Ballymagarry Chalk Formation fauna. | ||
=====Definition of upper boundary===== | |||
Definition of upper boundary | |||
Conformable, with the overlying Port Calliagh Chalk Formation, at a bedding plane below a ‘belt of complex flints’. | Conformable, with the overlying Port Calliagh Chalk Formation, at a bedding plane below a ‘belt of complex flints’. | ||
=====Thickness===== | |||
Thickness | |||
7.63m at type-site. | 7.63m at type-site. | ||
=====Distribution===== | |||
Distribution | |||
Outcrops in the Southern Uplands area, 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, 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 | |||
Tanderagee Chalk Member. | Tanderagee Chalk Member. | ||
=====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 (1977). | Fletcher (1977). | ||
[[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Ulster_White_Limestone_Group:_Post-Larry_Bane_Chalk_Subgroup | 06]] | [[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Ulster_White_Limestone_Group:_Post-Larry_Bane_Chalk_Subgroup | 06]] | ||
Revision as of 14:25, 10 February 2014
Name
The Tanderagee Chalk Member was first proposed in Fletcher (1977) and adopted in BGS publications subsequently. It is regarded as a formation herein.
Type section
Long Gilbert Quarry, Ballymagarry [C 889 407], south wall of western part of quarry.
Primary Reference Section
Numerous in the North Antrim Basin, the southern Londonderry Shelf and in the Southern Uplands. It is seen in sections between Magheralin and Trummery, Groganstown and the ‘Hairpin Bend’ region of Ballysillan, Ballycastle to Ballintoy, Portbraddan to Downhill and between Carmean and Stewartstown.
Formal subdivision
Includes the Long Gilbert Flint Band (of bed status) and informally divided into units A to E from the base.
Lithology
Limestone (chalk) with flint bands. Divided into five ‘Beds’ (A to E). Abundant belemnites in lower ‘Bed’ A and by an acme of crinoid debris in ‘Bed’ C. Elsewhere asteroid and crinoid debris common.
Definition of lower boundary
Conformable, on the Ballymagarry Chalk Formation, at a bedding plane immediately below the thick continuous tabulate Long Gilbert Flint Band where this exists. Or at the same bedding plane marking the faunal change from the Ballymagarry Chalk Formation fauna.
Definition of upper boundary
Conformable, with the overlying Port Calliagh Chalk Formation, at a bedding plane below a ‘belt of complex flints’.
Thickness
7.63m at type-site.
Distribution
Outcrops in the Southern Uplands area, 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
Tanderagee Chalk Member.
Parent
Ulster White Limestone Group.
Age and biostratigraphy
Upper Cretaceous, Maastrichtian. Belemnella lanceolata Zone?
References
Fletcher (1977).