Definition of claystone
i. A term applicable to indurated clay in the same sense as sandstone is applicable to indurated or cemented sand.
Synonym of: clay rock
See Also: mudstone, siltstone
ii. One of the concretionary masses of clay frequently found in alluvial deposits, in the form of flat rounded disks either simple or variously united so as to give rise to curious shapes.
Synonym of: clay rock
See Also: mudstone, siltstone
ii. One of the concretionary masses of clay frequently found in alluvial deposits, in the form of flat rounded disks either simple or variously united so as to give rise to curious shapes.