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Rutland's geologyRutland is a triangle of generally undulating land with its apex to the south. The eastern part includes an outcrop of ironstone, used extensively for building and giving a distinctive character to villages in that area. The excellent limestone from Ketton's quarries has been used locally and for many prestigious buildings, including the Tower of London, Windsor Castle, York Minster and Oxford colleges.The geology of Rutland is a classic example of the Mesozoic era in the East Midlands, primarily composed of a sequence of Jurassic sedimentary rocks that dip gently towards the east. The alternating layers of hard limestones and softer mudstones create a distinct, rolling landscape of scarp and dip slopes, deeply dissected by river valleys like the Gwash, where Rutland Water was formed. Geological FormationsThe bedrock geology is dominated by the Lias, Inferior Oolite, and Great Oolite groups, spanning the Early to Middle Jurassic periods. No igneous or metamorphic rocks are found at the surface.
Lower Jurassic: The Lias GroupThe oldest rocks exposed at the surface belong to the Lias Group, which consists of mudstones and limestones.Marlstone Rock Formation (Ironstone) A prominent, hard, fossiliferous, ferruginous limestone (locally an ironstone) that weathers to a characteristic golden-orange/brown colour. This formation forms the capping of the west-facing escarpment and has historically been used as a significant local building material, as seen in many buildings in Oakham and Uppingham. Whitby Mudstone Formation This lies above the Marlstone Rock and is a key formation for fossils, including a well-preserved ichthyosaur specimen discovered during the construction of Rutland Water. The mudstones and siltstones can be dark and rich in organic matter.
Britain's largest-ever ichthyosaur was recovered during the construction of Rutland Water. Middle Jurassic: The Oolite GroupsOverlying the Lias are the Inferior and Great Oolite groups, which are a sequence of limestones, sandstones, and mudstones.Northampton Sand Formation, part of the Inferior Oolite Group, is also ferruginous and weather to warm shades of brown and yellow. They were historically quarried for both iron ore and building stone (known locally as 'Uppingham Stone'). Lincolnshire Limestone Formation: This is the most substantial Middle Jurassic limestone unit in the East Midlands and a major source of building stone and aggregate for the region. The famous Clipsham Stone and Ketton Stone, used in historic buildings across the UK, come from quarries in this formation. The Great Oolite Group is a key geological feature of the area. It is a largely non-marine succession formed from muds and sands deposited in land-marginal areas, showing a repeated cycle of clays, limestones, and clastics. It is known for a famous Cetiosaurus dinosaur specimen found at Great Casterton.
How Cetiosaurus might have looked. Blisworth Limestone and Cornbrash Formations: Younger limestones in the sequence found in the east of the county. These formations are highly variable in character and rich in marine fossils like oysters and bivalves. Quaternary depositsScattered glacial till deposits are mostly on the higher ground in the west of the county. Along with alluvium floors the river valleys they are a legacy of the Anglian glaciation.Economic importanceHistorically, ironstone extraction was a major industry, but operations ceased in the 1970s. Today, the main mineral extraction is focused on the abundant limestone resources in the eastern half of the county, primarily for aggregate and cement manufacture at the important Ketton Cement Works, as well as for high-quality, locally distinctive building and roofing stone.
Ketton Cement Works in the 2020s.
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Rutland's historyhome page
long, long ago
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free online history resources
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