noun[mass noun] Geology
A mottled red and green limestone characteristic of the Old and the New Red Sandstone in Britain.
More example sentences
- The Bishops Frome Limestone and cornstones of the St Maughans Formation also have been used for this purpose.
- The soil is loam and the subsoil Old Red Sandstone, interstratified with cornstone at Pippin's Hill in the north.
- These cornstones are only exposed at low water, and occupy a position some 15 ft. or 20 ft. above the Parnell grit.