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Skiddaw Group

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Skiddaw Group

Skiddaw Group
Stratigraphic range: late Cambrian to mid Ordovician)
Type Group
Sub-units Bitter Beck Formation, Watch Hill Fmtn, Hope Beck, Loweswater Fmtn, Kirk Stile Fmtn, Catterpallot Fmatn, Buttermere Fmtn, Tarn Moor Fmtn, Murton Fmtn, Kirkland Fmtn
Underlies Borrowdale Volcanic Group, Eycott Volcanic Group
Lithology
Primary mudstone
Other siltstone, sandstone
Location
Region Cumbria
Country England
Extent northern Lake District, Black Combe & Cross Fell
Type section
Named for Skiddaw

For the Skiddaw group of hills, see Skiddaw Group

The Skiddaw Group is a group of sedimentary rock formations named after the mountain Skiddaw in the English Lake District. The rocks are Ordovician in age. They are largely mudstones and siltstones with subordinate wacke-type sandstones. Their main occurrence is within the northern and central fells of the Lake District but inliers are found at Black Combe in the south of the Lake District and at Cross Fell in the North Pennines.

In the Northern Fells of the Lake District, the Skiddaw Group comprises five formations of which the earliest/lowest is the Bitter Beck Formation. This is succeeded by the Watch Hill Formation, then the Hope Beck, Loweswater and Kirk Stile Formations in ascending order. The inlier at Cross Fell comprises just the Catterpallot Formation, a wacke sandstone which is the rough equivalent of the Watch Hill Formation, itself a wacke sandstone as is the Loweswater Formation.

Within the Central Fells are the Buttermere Formation and the overlying Tarn Moor Formation. These are matched by the Murton Formation (grey slates and thin sandstones) and the Kirkland Formation (mudstones with tuffs and lavas) at Cross Fell. The Buttermere Formation is interpreted as an olistostrome. The Tarn Moor and Kirkland Formations contain some volcaniclastic rocks. The inlier to the south at Black Combe contains the wackes of the Knott Hill Formation.

The group underlies the Borrowdale Volcanic Group in the southern and central Lake District and the Eycott Volcanic Group in the northern part of the district.[1]


References

  1. ^ Stone et al 2010 British Regional Geology. Northern England (5th edn) Keyworth, Nottingham. British Geological Survey
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