Raydale Dolostone Formation

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Raydale Dolostone Formation (RDO), Carboniferous, Northern England Province[edit]

Raydale Dolostone Formation is part of the Ravenstonedale Group

Name[edit]

The name is derived from the Raydale Dolomite Formation as described in the Raydale Borehole (see below). See Dunham and Wilson (1985, p. 26, fig. 5, and references therein[1]).

Lithology[edit]

The Raydale Dolostone Formation comprises thinly bedded and nodular dolostones (‘cementstones’) interbedded with siltstone and sandstone. The strata are similar to those present in the Ballagan Formation of the Midland Valley of Scotland and Northumberland Trough.

Genetic interpretation[edit]

Marginal marine

Stratotype[edit]

The formation occurs in the BGS Raydale Borehole (BGS Registration Number SD98SW/1) (SD 9026 8474) between about 463 and 495 m depth where it comprises thinly bedded and nodular dolostones with much interbedded siltstone and fine-grained sandstone (Dunham and Wilson, 1985, p. 26[1]).

Lower and upper boundaries[edit]

The formation occurs immediately above the Wensleydale Granite, which was reached in the Raydale Borehole (see above) at 495.05 m depth.

The top of the formation occurs at the base of the conglomeratic Marsett Formation (Figure 9, Column 17; Figure.15, Column 3).

Thickness[edit]

About 30 m.

Distribution and regional correlation[edit]

Askrigg Block.

Age and biostratigraphical characterisation[edit]

Miospores indicate a Chadian (post-Tournaisian) age for the formation (Owens, pers. comm. reported in Waters et al. 2007[2]).

References[edit]

  1. 1.0 1.1 Dunham, K C, and Wilson, A A.1985.Geology of the Northern Pennine Orefield: Volume 2, Stainmore to Craven.Economic Memoir of the British Geological Survey, Sheets 40, 41 and 50, parts 31, 32, 51, 60 and 61(England and Wales)
  2. Waters, C N, Browne, M A E, Dean, M T, and Powell, J H.2007.Lithostratigraphical framework for Carboniferous successions of Great Britain (Onshore).British Geological Survey Research Report, RR/07/01