Whitby Mudstone Formation

Whitby Mudstone Formation Stratigraphic range: Toarcian
Type	Geological formation
Unit of	Lias Group
Sub-units	Alum Shale Member
Underlies	Inferior Oolite Group, Ravenscar Group, Blea Wyke Formation or Bridport Sand Formation
Overlies	Marlstone Rock Formation or Cleveland Ironstone Formation
Area	Cleveland Basin, East Midlands Shelf & Worcester Graben
Thickness	up to 120 m
Lithology
Primary	mudstone
Other	siltstone
Location
Country	England
Type section
Named for	Whitby

The Whitby Mudstone Formation is a Toarcian (Lower Jurassic) geological formation in England. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.

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