The original source material for these web pages has been made available by the JNCC under the Open Government Licence 3.0. Full details in the JNCC Open Data Policy Mortimore, R.N., Wood, C.J. & Gallois, R.W. 2001. British Upper Cretaceous Stratigraphy. Geological Conservation Review Series, No. 23, JNCC, Peterborough.

Tables

(Table 1.1) [Image only]

(Table 3.1) Lithostratigraphy of the Upper Cretaceous at Wilmington Quarry.

Former names of units Current names
Middle and Upper Chalk (only Middle Chalk was ever present here) White Chalk Subgroup
Middle Chalk (Inoceramus labiatus Zone) Holywell Nodular Chalk Formation (including Beer Stone Member)
Cenomanian Limestone (Beds A–C)
Bed C of Cenomanian Limestone of authors Pinnacles Member with Haven Cliff
Hardground at top
Grey Chalk Subgroup
Beer Head Limestone Formation
(Bed B) Little Beach Member with Humble Point
Hardground at top
Grizzle and Wilmington Sand (Bed A2) Hooken Member (Wilmington Sand facies)
Basement Bed (Bed Al) Basement Bed (inferred Pounds Pool Member equivalent)
Lower Cretaceous
Upper Greensand FormationGreensand Formation Upper Greensand FormationGreensand Formation

(Table 3.2) Lithostratigraphy of Phillips (1818).

Lithostratigraphy (Phillips, 1818) Thickness Modifications (Whitaker, 1865a, Dowker, 1870)
The Chalk with numerous flints c. 350 ft (107 m)
I with few organic remains Broadstairs Chalk of Whitaker, 1865a;
Ramsgate Chalk of Dowker, 1870
II bed of organic remains and interspersed flints St Margaret's Chalk of Dowker, 1870
The Chalk with few flints c. 130 ft (40 m) Dover Chalk of Dowker, 1870
The Chalk without flints 140 ft (43 m)
I a stratum containing very numerous and thin beds of organic remains 90 ft (27 m)
II a stratum (of soft and white chalk) with few organic remains c. 50 ft (15 m)
The Grey Chalk not less than 200 ft
which graded down into (61 m)
Chalk Marle and Greensand

(Table 6.1) The Upper Cretaceous Inner Hebrides Group Succession in Mull.

Succession after Braley (1990); Lowden et al. (1992); More complete succession (Allt na Teangaidh) Less complete succession (Torosay Track) Variations Torosay Quarry Variations Feorlin Cottage Carsaig
Lava (presumed Tertiary) Lava Lava
Beinn Iadain Mudstone Formation 8. Mudstone (presumed Tertiary – possibly argillized ash); laterites Mudstone Top of section unknown Mudstone with lignite
Clach Alasdair Conglomerate Member 7. Silicified pale sandstone with flint intraclasts (presumed Upper Cretaceous); Flint conglomerate in sandy matrix showing evidence of debris flows Flint conglomerate at the top Flint conglomerate
Clach Alasdair Conglomerate Member 6. Silicified glauconitic greensand with flint clasts also piped down into or forming the matrix to the Gribun silicified chalk Possible thin dark-grey limestone with planktonic foraminifera Thick dark grey limestone in Torosay Quarry Thick wedge of white sandstone on top of chalk conglomerate at Feorlin Cottage
Gribun Chalk Formation 5. The Gribun or Scottish Chalk, in places with hints of internal bedding, containing inoceramid shell debris bands, sponges etc. (the inoceramids are Cretaceous but may be reworked as silicified chalks into younger greensand; or the chalk may represent silcrete formation first in the Late Cretaceous, then the Tertiary?) Resting on Rhaetic, Lias or Oxfordian Resting on Oxfordian Chalk conglomerate
4. Glauconitic greensand with flint intraclasts
Lochaline White Sandstone Formation 3. Pale buff sandstone (the White Sands) Thick white sandstone
2. Laminated and concretionary sandstone with oyster shell beds and Thalassinoides burrow bed
Morvern Greensand FormationGreensand Formation 1. Cenomanian greensand with manly units in expanded sections and containing Lower and/or Middle Cenomanian fossils. Basal pebble bed
Unconformity Upper Cretaceous resting on Lias or Oxfordian sediments Base of section unknown

References

(Table 1.1) Mapping units and formal and informal lithostratigraphical terms. Key references for the Chalk of each Province are shown.

(Table 3.1) Lithostratigraphy of the Upper Cretaceous at Wilmington Quarry.

(Table 3.2) Lithostratigraphy of Phillips (1818).

(Table 6.1) The Upper Cretaceous Inner Hebrides Group Succession in Mull.