Northern Ireland Chalk nomenclature (Ulster Cretaceous Province) - Hibernian Greensands Group: Island Magee Siltstones Formation: Difference between revisions
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=====Name===== | |||
Name | |||
The Island Magee Siltstones Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein. | The Island Magee Siltstones Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein. | ||
=====Type section===== | |||
Type section | |||
Collin Glen [J 269 702] (Belfast area), Cloghfin [J 483 938] (Carrickfergus area), Magheramorne area [J 430 980] (Larne area). | Collin Glen [J 269 702] (Belfast area), Cloghfin [J 483 938] (Carrickfergus area), Magheramorne area [J 430 980] (Larne area). | ||
=====Primary Reference Section===== | |||
Primary Reference Section | |||
Kilcoan Old Quarry [J 4610 9850] and numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A). | Kilcoan Old Quarry [J 4610 9850] and numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A). | ||
=====Formal subdivisions===== | |||
Formal subdivisions | |||
None | None | ||
=====Definition of upper boundary===== | |||
Definition of upper boundary | |||
Disconformable with the Collinwell Sands Formation and unconformable with the Kilcoan Sands Formation beneath the so-called Turonian non-sequence of the Hibernian Greensands Group. | Disconformable with the Collinwell Sands Formation and unconformable with the Kilcoan Sands Formation beneath the so-called Turonian non-sequence of the Hibernian Greensands Group. | ||
=====Definition of lower boundary===== | |||
Definition of lower boundary | |||
Conformable with Belfast Marls Formation with the boundary arbitrarily taken at the base of the first upwardly occurring hard calcareous siltstone above the transitional top of the preceding formation. | Conformable with Belfast Marls Formation with the boundary arbitrarily taken at the base of the first upwardly occurring hard calcareous siltstone above the transitional top of the preceding formation. | ||
=====Lithology===== | |||
Lithology | |||
Hard and soft grey siltstones and marls (calcareous siltstones) that weather to a pale yellow colour. | Hard and soft grey siltstones and marls (calcareous siltstones) that weather to a pale yellow colour. | ||
=====Distribution===== | |||
Distribution | |||
East Antrim Basin and the Southern Uplands area of Northern Ireland. | East Antrim Basin and the Southern Uplands area of Northern Ireland. | ||
=====Thickness===== | |||
Thickness | |||
A maximum of 8.0m in the Magheramorne area and a minimum of 0.67m over the Knockagh Axis north of Belfast. | A maximum of 8.0m in the Magheramorne area and a minimum of 0.67m over the Knockagh Axis north of Belfast. | ||
=====Previous names===== | |||
Previous names | |||
The Grey Marls and Yellow Sandstones with Chert of Tate (1865) and Reid (1971); Yellow Sandstones of Hume (1897) and Hancock (1961); Yellow Sandstones and Grey Marls of Manning, Robbie and Wilson (1970). | The Grey Marls and Yellow Sandstones with Chert of Tate (1865) and Reid (1971); Yellow Sandstones of Hume (1897) and Hancock (1961); Yellow Sandstones and Grey Marls of Manning, Robbie and Wilson (1970). | ||
Island Magee Siltstones Member. | Island Magee Siltstones Member. | ||
=====Parent===== | |||
Parent | |||
Hibernian Greensands Group. | Hibernian Greensands Group. | ||
=====Age and biostratigraphy===== | |||
Age and biostratigraphy | |||
Upper Cretaceous, Cenomanian. ''Acanthoceras rhotomagense'' Zone. | Upper Cretaceous, Cenomanian. ''Acanthoceras rhotomagense'' Zone. | ||
=====''References''===== | |||
''References'' | |||
Griffith and Wilson (1982). | Griffith and Wilson (1982). | ||
[[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Hibernian_Greensands_Group | 02]] | [[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Hibernian_Greensands_Group | 02]] | ||
Latest revision as of 13:09, 11 June 2014
Name
The Island Magee Siltstones Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein.
Type section
Collin Glen [J 269 702] (Belfast area), Cloghfin [J 483 938] (Carrickfergus area), Magheramorne area [J 430 980] (Larne area).
Primary Reference Section
Kilcoan Old Quarry [J 4610 9850] and numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A).
Formal subdivisions
None
Definition of upper boundary
Disconformable with the Collinwell Sands Formation and unconformable with the Kilcoan Sands Formation beneath the so-called Turonian non-sequence of the Hibernian Greensands Group.
Definition of lower boundary
Conformable with Belfast Marls Formation with the boundary arbitrarily taken at the base of the first upwardly occurring hard calcareous siltstone above the transitional top of the preceding formation.
Lithology
Hard and soft grey siltstones and marls (calcareous siltstones) that weather to a pale yellow colour.
Distribution
East Antrim Basin and the Southern Uplands area of Northern Ireland.
Thickness
A maximum of 8.0m in the Magheramorne area and a minimum of 0.67m over the Knockagh Axis north of Belfast.
Previous names
The Grey Marls and Yellow Sandstones with Chert of Tate (1865) and Reid (1971); Yellow Sandstones of Hume (1897) and Hancock (1961); Yellow Sandstones and Grey Marls of Manning, Robbie and Wilson (1970).
Island Magee Siltstones Member.
Parent
Hibernian Greensands Group.
Age and biostratigraphy
Upper Cretaceous, Cenomanian. Acanthoceras rhotomagense Zone.
References
Griffith and Wilson (1982).