Scotland Chalk nomenclature (Scottish Chalk Province) - Inner Hebrides Group: Beinn Iadain Mudstone Formation: Difference between revisions

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=====''Name''=====
 
''Name''
 
 
 
The Beinn Iadain Mudstone Formation was formally proposed by Braley (1990).
The Beinn Iadain Mudstone Formation was formally proposed by Braley (1990).


 
=====''Type section''=====
 
 
 
 
 
''Type section''
 
 
 
Beinn Iadain section A of Braley (1990) [NM 6917 5490] in Morvern.
Beinn Iadain section A of Braley (1990) [NM 6917 5490] in Morvern.


 
=====''Primary Reference Section''=====
 
'' ''
 
 
 
''Primary Reference Section''
 
 
 
Allt na Teangaidh [NM 453 328] on Mull.
Allt na Teangaidh [NM 453 328] on Mull.


 
=====Formal subdivision=====
 
 
 
 
 
Formal subdivision
 
 
 
Considered by Braley (1990) to include the Feorlin Sandstone Member.
Considered by Braley (1990) to include the Feorlin Sandstone Member.


 
=====''Lithology ''=====
 
 
 
 
 
''Lithology ''
 
 
 
Mudstone and siltstone, shaly and micaceous, red to purplish in colour but bleached white in places considered to be ‘argillized ash’ by Mortimore et al. (2001). Organic rich and sandy in lower part.
Mudstone and siltstone, shaly and micaceous, red to purplish in colour but bleached white in places considered to be ‘argillized ash’ by Mortimore et al. (2001). Organic rich and sandy in lower part.


 
=====''Definition of upper boundary''=====
 
 
 
 
 
''Definition of upper boundary''
 
 
 
Disconformable at a sharp contact beneath Paleocene lavas.
Disconformable at a sharp contact beneath Paleocene lavas.


 
=====''Definition of lower boundary ''=====
 
 
 
 
 
''Definition of lower boundary ''
 
 
 
Unconformable above an erosive contact with underlying conglomerates of the Clach Alasdair Conglomerate Member.
Unconformable above an erosive contact with underlying conglomerates of the Clach Alasdair Conglomerate Member.


 
=====''Thickness''=====
 
 
 
 
 
''Thickness''
 
 
 
2.5 m at Allt na Teangaidh on Mull, c.1.9 m at Feorlin tributary section [NM 5317 2225], 0.92 m at the type site on Beinn Iadain.
2.5 m at Allt na Teangaidh on Mull, c.1.9 m at Feorlin tributary section [NM 5317 2225], 0.92 m at the type site on Beinn Iadain.


 
=====Distribution=====
 
 
 
 
 
Distribution
 
 
 
Known from Morvern and the island of Mull.
Known from Morvern and the island of Mull.


 
=====''Previous names''=====
 
 
 
 
 
''Previous names''
 
 
 
Considered by Braley (1990) to be equivalent to the ‘Upper Estuarine Series’ of Judd (1878).
Considered by Braley (1990) to be equivalent to the ‘Upper Estuarine Series’ of Judd (1878).


 
=====Parent=====
 
 
 
 
 
Parent
 
 
 
Inner Hebrides Group.
Inner Hebrides Group.


 
=====Age and biostratigraphy=====
 
 
 
 
 
Age and biostratigraphy
 
 
 
Upper Cretaceous or Paleocene.
Upper Cretaceous or Paleocene.


 
=====''References''=====
 
 
 
 
 
''References''
 
 
 
Braley (1990); Lowden, Braley, Hurst and Lewis (1992); Mortimore, Wood and Gallois (2001).
Braley (1990); Lowden, Braley, Hurst and Lewis (1992); Mortimore, Wood and Gallois (2001).


In this volume a number of the correlations in the earlier works are adjusted and the dating of the sequence refined. The name is given Formational status in the sequences on Mull.
In this volume a number of the correlations in the earlier works are adjusted and the dating of the sequence refined. The name is given Formational status in the sequences on Mull.


[[category:Scotland_Chalk_nomenclature_(Scottish_Chalk_Province)_-_Inner_Hebrides_Group | 07]]
[[category:Scotland_Chalk_nomenclature_(Scottish_Chalk_Province)_-_Inner_Hebrides_Group | 07]]

Revision as of 11:42, 7 February 2014

Name

The Beinn Iadain Mudstone Formation was formally proposed by Braley (1990).

Type section

Beinn Iadain section A of Braley (1990) [NM 6917 5490] in Morvern.

Primary Reference Section

Allt na Teangaidh [NM 453 328] on Mull.

Formal subdivision

Considered by Braley (1990) to include the Feorlin Sandstone Member.

Lithology

Mudstone and siltstone, shaly and micaceous, red to purplish in colour but bleached white in places considered to be ‘argillized ash’ by Mortimore et al. (2001). Organic rich and sandy in lower part.

Definition of upper boundary

Disconformable at a sharp contact beneath Paleocene lavas.

Definition of lower boundary

Unconformable above an erosive contact with underlying conglomerates of the Clach Alasdair Conglomerate Member.

Thickness

2.5 m at Allt na Teangaidh on Mull, c.1.9 m at Feorlin tributary section [NM 5317 2225], 0.92 m at the type site on Beinn Iadain.

Distribution

Known from Morvern and the island of Mull.

Previous names

Considered by Braley (1990) to be equivalent to the ‘Upper Estuarine Series’ of Judd (1878).

Parent

Inner Hebrides Group.

Age and biostratigraphy

Upper Cretaceous or Paleocene.

References

Braley (1990); Lowden, Braley, Hurst and Lewis (1992); Mortimore, Wood and Gallois (2001).

In this volume a number of the correlations in the earlier works are adjusted and the dating of the sequence refined. The name is given Formational status in the sequences on Mull.

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