Earth:Holsworthy Group

Holsworthy Group Stratigraphic range: Namurian to Bolsovian (Carboniferous)
Chevron folded alternations of sandstone and mudstone of the Crackington Formation, Warren Bay, Hartland Quay
Type	Group
Unit of	Culm Supergroup
Sub-units	Crackington Formation, Bideford Formation, Bude Formation
Underlies	Exeter Group
Overlies	Teign Valley Group
Thickness	3500 to 4000m
Lithology
Primary	mudstones,
Other	siltstones, sandstones, conglomerates
Location
Region	England
Country	United Kingdom
Extent	north and east Cornwall to north and east Devon
Type section
Named for	Holsworthy

The Holsworthy Group is a late Carboniferous lithostratigraphic group (a sequence of rock strata) in north and east Cornwall and Devon in southwest England . The name is derived from the Devon town of Holsworthy. The Group comprises (in ascending order i.e. oldest first) the Crackington, Bideford and Bude formations. In the Launceston area the group is represented by the Bealsmill Formation. It was formerly known as the Upper Culm Group.