Ravenscar Group
The Ravenscar Group is a Jurassic lithostratigraphic group found within the Cleveland Basin of North Yorkshire, extending into both the Hambleton and Howardian Hills. The name is derived from Ravenscar on the North Yorkshire coast, where rocks of this age occur. It was previously known as the 'Middle Jurassic Series'. It is stratigraphic equivalent to the Inferior Oolite Group and most of the Great Oolite Group, being overlain by the Cornbrash Formation of the latter unit.