Charmouth Mudstone Formation

Charmouth Mudstone Formation Stratigraphic range: Sinemurian–Pliensbachian
Type	Formation
Unit of	Lias Group
Underlies	Dyrham Formation, Marlstone Rock Formation
Overlies	Blue Lias Formation
Area	Wessex Basin, Worcester Basin, East Midland Shelf
Thickness	~335 m
Lithology
Primary	shale, mudstone
Other	limestone, sand
Location
Region	England
Country	United Kingdom
Type section
Named for	Charmouth

The Charmouth Mudstone Formation is a geological formation in England. It preserves fossils dating back to the early part of the Jurassic period (Sinemurian–Pliensbachian).