noun[mass noun] Geology
- An earthy fossiliferous limestone occurring widely in England in a thin formation of Jurassic age.More example sentences
- 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.