Stockdale Group

The Stockdale Group is a Silurian lithostratigraphic group (a sequence of rock strata) in the southern Lake District and Howgill Fells of the Pennines of northern England. The name is derived from the locality of Stockdale near the top of Longsleddale in Cumbria. It is included within the Windermere Supergroup. The rocks of the Group have also previously been referred to as the Stockdale Shales or Stockdale Subgroup. The group comprises limestones and oolites and some sandstones and shales which reach a maximum thickness of 120m in the area. It is divided into a lower Skelgill Formation which is overlain by an upper Browgill Formation.[1]

Stockdale Group Stratigraphic range: Llandovery epoch of Silurian
Type	Group
Unit of	Windermere Supergroup
Sub-units	Skelgill and Browgill formations
Underlies	Tranearth Group
Overlies	Dent Group
Thickness	up to 120m
Lithology
Primary	mudstone, siltstone
Location
Region	Northern England
Country	England
Extent	southern Lake District and Pennine inliers
Type section
Named for	Stockdale in Longsleddale

References

1. "Stockdale Group". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved January 20, 2019.

• The Geological Society (2006). Brenchley, P.J. (ed.). The Geology of England (2. ed.). London: Geological Society Publishing. pp. 124–126. ISBN 9781862392007.