Northern Ireland Chalk nomenclature (Ulster Cretaceous Province) - Hibernian Greensands Group: Belfast Marls Formation: Difference between revisions

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Name
=====Name=====
The Belfast Marls Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein
The Belfast Marls Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein


Type section
=====Type section=====
Cloghfin Port area [J 483 938] where three exposures of the formation occur, Woodburn Glen South and 503 m north-west of Knock Lodge.
Cloghfin Port area [J 483 938] where three exposures of the formation occur, Woodburn Glen South and 503 m north-west of Knock Lodge.


Primary Reference Section
=====Primary Reference Section=====
Carrs Glen near Belfast [J 311 793], in a borehole near Magheramorne [J 433 975]. Numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A).
Carrs Glen near Belfast [J 311 793], in a borehole near Magheramorne [J 433 975]. 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


 
=====Lithology=====
 
 
 
 
 
Lithology
 
 
 
Pale grey strongly bioturbated silty marls with a scattering of dark green glauconite grains (not exceeding 40%). Transitional ‘zone’ at the top contains relatively little glauconite. Fossiliferous with concentrations into discreet laterally continuous shell-beds. '' ''
Pale grey strongly bioturbated silty marls with a scattering of dark green glauconite grains (not exceeding 40%). Transitional ‘zone’ at the top contains relatively little glauconite. Fossiliferous with concentrations into discreet laterally continuous shell-beds. '' ''
 
=====Definition of upper boundary=====
 
 
 
 
 
 
Definition of upper boundary
 
 
 
Conformable, junction arbitrarily drawn at the base of the lowest persistent hard calcareous siltstone of the overlying Island Magee Siltstones Formation. This junction appears at the top of a transitional zone showing an upward decrease in glauconite content.
Conformable, junction arbitrarily drawn at the base of the lowest persistent hard calcareous siltstone of the overlying Island Magee Siltstones Formation. This junction appears at the top of a transitional zone showing an upward decrease in glauconite content.


 
=====Definition of lower boundary=====
 
 
 
 
 
Definition of lower boundary
 
 
 
Unconformable, oversteps various older units.'' ''
Unconformable, oversteps various older units.'' ''


 
=====Thickness=====
 
 
 
 
 
Thickness
 
 
 
Maximum thickness of a little less than 3.0m known from a borehole near Magheramorne [J 433 975] in the Larne (sheet 21) area. Minimum thickness of 1.6m over the Knockagh Axis north of Belfast.
Maximum thickness of a little less than 3.0m known from a borehole near Magheramorne [J 433 975] in the Larne (sheet 21) area. Minimum thickness of 1.6m over the Knockagh Axis north of Belfast.


 
=====Distribution=====
 
 
 
 
 
Distribution
 
 
 
East Antrim Basin and Southern Uplands area of Northern Ireland.
East Antrim Basin and Southern Uplands area of Northern Ireland.


 
=====Previous names=====
 
 
 
 
 
Previous names
 
 
 
Glauconitic Sands of Tate (1865) and subsequent workers.
Glauconitic Sands of Tate (1865) and subsequent workers.


====''Belfast Marls Member''====


 
=====Parent=====
Belfast Marls Member
 
 
 
 
 
 
 
Parent
 
 
 
Hibernian Greensand Group.
Hibernian Greensand Group.


 
=====''Age and biostratigraphy''=====
 
 
 
 
 
''Age and biostratigraphy''
 
 
 
Upper Cretaceous, Cenomanian. ''Mantelliceras mantelli'' to basal ''Acanthocerus rhotomagense'' Zone.'' ''
Upper Cretaceous, Cenomanian. ''Mantelliceras mantelli'' to basal ''Acanthocerus rhotomagense'' Zone.'' ''


 
=====References=====
 
 
 
 
 
References
 
 
 
Griffith and Wilson (1982).
Griffith and Wilson (1982).


[[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Hibernian_Greensands_Group | 01]]
[[category:Northern_Ireland_Chalk_nomenclature_(Ulster_Cretaceous_Province)_-_Hibernian_Greensands_Group | 01]]

Latest revision as of 13:09, 11 June 2014

Name

The Belfast Marls Member was first used in Griffith and Wilson (1982). The term is upgraded to formation status herein

Type section

Cloghfin Port area [J 483 938] where three exposures of the formation occur, Woodburn Glen South and 503 m north-west of Knock Lodge.

Primary Reference Section

Carrs Glen near Belfast [J 311 793], in a borehole near Magheramorne [J 433 975]. Numerous localities on the Larne, Antrim, Carrickfergus and Belfast sheet areas (see Griffith and Wilson (1982), Page 48, Figure 16A).

Formal subdivisions

None

Lithology

Pale grey strongly bioturbated silty marls with a scattering of dark green glauconite grains (not exceeding 40%). Transitional ‘zone’ at the top contains relatively little glauconite. Fossiliferous with concentrations into discreet laterally continuous shell-beds.

Definition of upper boundary

Conformable, junction arbitrarily drawn at the base of the lowest persistent hard calcareous siltstone of the overlying Island Magee Siltstones Formation. This junction appears at the top of a transitional zone showing an upward decrease in glauconite content.

Definition of lower boundary

Unconformable, oversteps various older units.

Thickness

Maximum thickness of a little less than 3.0m known from a borehole near Magheramorne [J 433 975] in the Larne (sheet 21) area. Minimum thickness of 1.6m over the Knockagh Axis north of Belfast.

Distribution

East Antrim Basin and Southern Uplands area of Northern Ireland.

Previous names

Glauconitic Sands of Tate (1865) and subsequent workers.

Belfast Marls Member

Parent

Hibernian Greensand Group.

Age and biostratigraphy

Upper Cretaceous, Cenomanian. Mantelliceras mantelli to basal Acanthocerus rhotomagense Zone.

References

Griffith and Wilson (1982).

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