Difference between revisions of "Pinskey Gill Formation"

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Latest revision as of 15:53, 26 July 2021

Pinskey Gill Formation (PNKG), Carboniferous, Northern England Province[edit]

Pinskey Gill Formation is part of the Ravenstonedale Group

Name[edit]

Derived from Pinskey Gill, by Newbiggin on Lune, Cumbria. The formation was originally named the Pinskey Gill Beds by Garwood (1913, p. 496)[1].

Lithology[edit]

The Pinskey Gill Formation comprises grey, vuggy, dolomitic limestone and dolostone interbedded with grey to dark grey calcareous mudstone and thin-bedded, calcareous, silty sandstone.

Genetic interpretation[edit]

The strata were deposited in a peritidal marine and fluvial environment.

Stratotype[edit]

The type section is in Pinskey Gill (NY 698 040) where the formation is about 20 m thick and comprises beds of sandstone, calcareous mudstone with sporadic pebbles, sandy shale, interbedded mudstone and shale, and dolomite, (see Garwood, 1913, pp. 496– 499[1]).

Lower and upper boundaries[edit]

The formation rests unconformably upon a smooth planation surface cut into Lower Palaeozoic strata. Conglomerate beds of the Marsett Formation overlie it unconformably (Figure 9, Column 16).

Thickness[edit]

Up to 50 m.

Distribution and regional correlation[edit]

The formation is found only at Ravenstonedale in the Stainmore Trough.

Age and biostratigraphical characterisation[edit]

Miospores including Schopfites claviger and S. delicatus of the CM and possibly PC zones (Johnson and Marshall, 1971[2]; Holliday et al., 1979[3]) and conodonts dominated by Bispathodus aculeatus aculeatus, B. stabilis and Clydagnathus unicornis of the Pseudopolygnathus multistriatus Zone (Varker and Higgins, 1979[4]; Varker and Sevastopulo, 1985[5]) indicate a Tournaisian (mid Courceyan) age for the formation (Table 2).

References[edit]

  1. 1.0 1.1 Garwood, E J.1913.The Lower Carboniferous succession in the north-west of England.Quarterly Journal of the Geological Society, Vol. 68, 449–596.
  2. Johnson, G A L, and Marshall, A E.1971.Tournaisian beds in Ravenstonedale, Westmorland.Proceedings of the Yorkshire Geological Society, Vol. 38, 261–280
  3. Holliday, D W, Neves, R, and Owens, B.1979.Stratigraphy and palynology of early Dinantian (Carboniferous) strata in shallow boreholes near Ravenstonedale, Cumbria.Proceedings of the Yorkshire Geological Society, Vol. 42, 343–356.
  4. Varker, W J, and Higgins, A C.1979.Conodont evidence for the age of the Pinskey Gill Beds of Ravenstonedale, north-west England.Proceedings of the Yorkshire Geological Society,Vol. 42, 357–369
  5. Varker, W J, and Sevastopulo, G D.1985.The Carboniferous System: Part 1.—.conodonts of the Dinantian Subsystem from Great Britain and Ireland.167–209 in A Stratigraphical Index of Conodonts. Higgins, A C, and Austin, R L (editors). (Chichester: Ellis Horwood Limited for the British Micropalaeontological Society)