The Teign Valley Group is a late Devonian to late/middle Carboniferous lithostratigraphic group (a sequence of rock strata) in north Cornwall through Devon and into west Somerset in southwest England.

The Group comprises (in ascending order i.e. oldest first) the Barras Nose, Trambley Cove, Teign Chert and Dowhills Mudstone formations.

It also includes the Brendon and St Mellion formations whose stratigraphical context is unclear since all known boundaries of these two unit are tectonic.

The Brendon Formation slates extend from Tavistock west to Bodmin Moor.

[1][2] The St Mellion Formation sandstones, siltstones and mudstones are found from Holne northeastwards.