Skiddaw Group

Skiddaw Group Stratigraphic range: late Cambrian to mid Ordovician)
Slates of the Kirk Stile Formation, exposed just below Skiddaw summit ridge
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
Thickness	5 km
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 almost wholly Ordovician in age (Tremadoc through Arenig to Llanvirn epochs) though the lowermost beds are possibly of Cambrian age. This rock sequence has previously been known as the Skiddaw Slates, the Skiddaw Slates Group and the Skiddavian Series. Its base is not exposed but in its main outcrop area, it is considered to be in excess of 5000m thick though less elsewhere. It consists largely of mudstones and siltstones with subordinate wacke-type sandstones. Their main occurrence is within the northern and central fells of the Lake District, either side of the major ENE-WSW aligned Causey Pike Fault, 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.