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.[1]

References

  1. http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=HOWY (BGS on-line lexicon of rock units)