Northern Ireland Chalk nomenclature (Ulster Cretaceous Province) - Hibernian Greensands Group: Kilcoan Sands Formation: Difference between revisions
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=====Name===== | |||
Name | |||
The Kilcoan Sands Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein. | The Kilcoan Sands Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein. | ||
=====Type section===== | |||
Type section | |||
The old cutting to the old Kilcoan Quarry [J 4610 9850] west Island Magee. | The old cutting to the old Kilcoan Quarry [J 4610 9850] west Island Magee. | ||
=====''Primary Reference Section''===== | |||
''Primary Reference Section'' | |||
Numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A). | Numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A). | ||
=====Formal subdivision===== | |||
Formal subdivision | |||
None | None | ||
=====Lithology===== | |||
Lithology | |||
Pale green glauconitic sands thought largely to be derived from the Collinwell Sands Formation. Three conspicuous Inoceramus bands divide the succession into three unequal parts. | Pale green glauconitic sands thought largely to be derived from the Collinwell Sands Formation. Three conspicuous Inoceramus bands divide the succession into three unequal parts. | ||
=====Definition of lower boundary===== | |||
Definition of lower boundary | |||
Disconformable at an erosion surface above the mid-Hibernian Greensands ‘unconformity’. Rests on each of the older formations in the group and overlaps onto pre-Cretaceous strata over the most positive structural highs. | Disconformable at an erosion surface above the mid-Hibernian Greensands ‘unconformity’. Rests on each of the older formations in the group and overlaps onto pre-Cretaceous strata over the most positive structural highs. | ||
=====Definition of upper boundary===== | |||
Definition of upper boundary | |||
Disconformable at an erosion surface beneath various younger members of the Ulster White Limestone Group. | Disconformable at an erosion surface beneath various younger members of the Ulster White Limestone Group. | ||
=====Thickness===== | |||
Thickness | |||
Up to 7.3m at Kilcoan. | Up to 7.3m at Kilcoan. | ||
=====Distribution===== | |||
Distribution | |||
Fully developed in the Island Magee area and within the East Antrim Basin and Southern Uplands area. Elsewhere in Northern Ireland the formation may be represented in the condensed successions of the undivided Hibernian Greensands Group. | Fully developed in the Island Magee area and within the East Antrim Basin and Southern Uplands area. Elsewhere in Northern Ireland the formation may be represented in the condensed successions of the undivided Hibernian Greensands Group. | ||
=====Previous names===== | |||
Previous names | |||
Part of the Chloritic Sands and Sandstones of Tate (1865) and Hume (1897); part of the Upper Glauconitic Beds of Hancock (1961); The Upper Hibernian Greensands of Reid (1971); Senonian Greensands of Manning, Robbie and Wilson (1970). | Part of the Chloritic Sands and Sandstones of Tate (1865) and Hume (1897); part of the Upper Glauconitic Beds of Hancock (1961); The Upper Hibernian Greensands of Reid (1971); Senonian Greensands of Manning, Robbie and Wilson (1970). | ||
Kilcoan Sands Member. | Kilcoan Sands Member. | ||
=====Parent===== | |||
Parent | |||
Hibernian Greensands Group. | Hibernian Greensands Group. | ||
=====''Age and biostratigraphy ''===== | |||
''Age and biostratigraphy '' | |||
Coniacian to Santonian. ''Micraster cortestudinarium'' to ''Micraster coranguinum'' zones. | Coniacian to Santonian. ''Micraster cortestudinarium'' to ''Micraster coranguinum'' zones. | ||
=====''References''===== | |||
''References'' | |||
Fletcher (1967); Griffith and Wilson (1982). | Fletcher (1967); Griffith and Wilson (1982). | ||
[[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Hibernian_Greensands_Group | 04]] | [[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Hibernian_Greensands_Group | 04]] | ||
Latest revision as of 12:10, 11 June 2014
Name
The Kilcoan Sands Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein.
Type section
The old cutting to the old Kilcoan Quarry [J 4610 9850] west Island Magee.
Primary Reference Section
Numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A).
Formal subdivision
None
Lithology
Pale green glauconitic sands thought largely to be derived from the Collinwell Sands Formation. Three conspicuous Inoceramus bands divide the succession into three unequal parts.
Definition of lower boundary
Disconformable at an erosion surface above the mid-Hibernian Greensands ‘unconformity’. Rests on each of the older formations in the group and overlaps onto pre-Cretaceous strata over the most positive structural highs.
Definition of upper boundary
Disconformable at an erosion surface beneath various younger members of the Ulster White Limestone Group.
Thickness
Up to 7.3m at Kilcoan.
Distribution
Fully developed in the Island Magee area and within the East Antrim Basin and Southern Uplands area. Elsewhere in Northern Ireland the formation may be represented in the condensed successions of the undivided Hibernian Greensands Group.
Previous names
Part of the Chloritic Sands and Sandstones of Tate (1865) and Hume (1897); part of the Upper Glauconitic Beds of Hancock (1961); The Upper Hibernian Greensands of Reid (1971); Senonian Greensands of Manning, Robbie and Wilson (1970).
Kilcoan Sands Member.
Parent
Hibernian Greensands Group.
Age and biostratigraphy
Coniacian to Santonian. Micraster cortestudinarium to Micraster coranguinum zones.
References
Fletcher (1967); Griffith and Wilson (1982).