noun[mass noun] Geology
An earthy fossiliferous limestone occurring widely in England in a thin formation of Jurassic age.
- In the sandy bed of the spring can be found tiny fossils shaped like stars, which are constantly being freed from the fossil-bearing cornbrash below by the action of the spring water, which then carries them up to the surface.
- Cornbrash is a variety of limestone underlying the local gravels already extracted.
- This is the most complete section of exposed Cornbrash along the Dorset coast.
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