Northern Ireland Chalk nomenclature (Ulster Cretaceous Province) - Ulster White Limestone Group: Pre-Larry Bane Chalk Subgroup: Galboly Chalk Formation: Difference between revisions
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=====Name===== | |||
Name | |||
The Galboly Chalk Member was first proposed in Fletcher (1967, 1977) and adopted in BGS publications subsequently. It is regarded as a formation herein. | The Galboly Chalk Member was first proposed in Fletcher (1967, 1977) and adopted in BGS publications subsequently. It is regarded as a formation herein. | ||
=====Type section===== | |||
Type section | |||
Roadside ‘pillar’ south of Garron Point [Irish Grid Reference [D 301 245] but this site is noted in Fletcher (1977) as being within an unstable residual block near to the main road. An alternative type section can be ‘built-up’ from foreshore blocks or from the indifferently exposed old quarry at Milltown [D 255 243]. | Roadside ‘pillar’ south of Garron Point [Irish Grid Reference [D 301 245] but this site is noted in Fletcher (1977) as being within an unstable residual block near to the main road. An alternative type section can be ‘built-up’ from foreshore blocks or from the indifferently exposed old quarry at Milltown [D 255 243]. | ||
=====Primary Reference Section===== | |||
Primary Reference Section | |||
Milltown [D 255 243] and in central Murlough Bay [D 200 401]. | Milltown [D 255 243] and in central Murlough Bay [D 200 401]. | ||
=====Formal subdivisions===== | |||
Formal subdivisions | |||
None | None | ||
=====Lithology===== | |||
Lithology | |||
Chalk, with some flint bands and ‘incipient flints’. Marl partings common to base with some glauconite.'' '' | Chalk, with some flint bands and ‘incipient flints’. Marl partings common to base with some glauconite.'' '' | ||
=====Definition of lower boundary===== | |||
Definition of lower boundary | |||
The exact relationship with the underlying Cloghfin Sponge Formation is not certain (Fletcher, 1978 p. 8 para 2). It is taken a well-developed separation plane above which the beds contain no appreciable arenaceous ‘contamination’. | The exact relationship with the underlying Cloghfin Sponge Formation is not certain (Fletcher, 1978 p. 8 para 2). It is taken a well-developed separation plane above which the beds contain no appreciable arenaceous ‘contamination’. | ||
=====Definition of upper boundary===== | |||
Definition of upper boundary | |||
At a prominent bedding plane (an erosion surface in part) immediately above a zone of wavy and disturbed bedding. Overlain by the Cloghastucan Chalk Formation. | At a prominent bedding plane (an erosion surface in part) immediately above a zone of wavy and disturbed bedding. Overlain by the Cloghastucan Chalk Formation. | ||
=====''Thickness''===== | |||
''Thickness'' | |||
5.85m at its type section. | 5.85m at its type section. | ||
=====Distribution===== | |||
Distribution | |||
Known throughout the North Antrim and East Antrim Basins and part of the Southern Upland, Highland Border and northern Londonderry Shelf. Absent elsewhere. | Known throughout the North Antrim and East Antrim Basins and part of the Southern Upland, Highland Border and northern Londonderry Shelf. Absent elsewhere. | ||
====''Previous names''==== | |||
''Previous names'' | |||
Galboly Chalk Member. | Galboly Chalk Member. | ||
====Parent===== | |||
Parent | |||
Ulster White Limestone Group. | Ulster White Limestone Group. | ||
=====''Age and biostratigraphy ''===== | |||
''Age and biostratigraphy '' | |||
Upper Cretaceous, Santonian. ''Uintacrinus socialis'' Zone (in part). | Upper Cretaceous, Santonian. ''Uintacrinus socialis'' Zone (in part). | ||
=====''References''===== | |||
''References'' | |||
Fletcher (1967, 1977). | Fletcher (1967, 1977). | ||
[[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Ulster_White_Limestone_Group:_Pre-Larry_Bane_Chalk_Subgroup | 02]] | [[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Ulster_White_Limestone_Group:_Pre-Larry_Bane_Chalk_Subgroup | 02]] | ||
Latest revision as of 13:11, 11 June 2014
Name
The Galboly Chalk Member was first proposed in Fletcher (1967, 1977) and adopted in BGS publications subsequently. It is regarded as a formation herein.
Type section
Roadside ‘pillar’ south of Garron Point [Irish Grid Reference [D 301 245] but this site is noted in Fletcher (1977) as being within an unstable residual block near to the main road. An alternative type section can be ‘built-up’ from foreshore blocks or from the indifferently exposed old quarry at Milltown [D 255 243].
Primary Reference Section
Milltown [D 255 243] and in central Murlough Bay [D 200 401].
Formal subdivisions
None
Lithology
Chalk, with some flint bands and ‘incipient flints’. Marl partings common to base with some glauconite.
Definition of lower boundary
The exact relationship with the underlying Cloghfin Sponge Formation is not certain (Fletcher, 1978 p. 8 para 2). It is taken a well-developed separation plane above which the beds contain no appreciable arenaceous ‘contamination’.
Definition of upper boundary
At a prominent bedding plane (an erosion surface in part) immediately above a zone of wavy and disturbed bedding. Overlain by the Cloghastucan Chalk Formation.
Thickness
5.85m at its type section.
Distribution
Known throughout the North Antrim and East Antrim Basins and part of the Southern Upland, Highland Border and northern Londonderry Shelf. Absent elsewhere.
Previous names
Galboly Chalk Member.
Parent=
Ulster White Limestone Group.
Age and biostratigraphy
Upper Cretaceous, Santonian. Uintacrinus socialis Zone (in part).
References
Fletcher (1967, 1977).