shale

English Thesaurus

1. a sedimentary rock formed by the deposition of successive layers of clay (noun.substance)

hypernym	:	sedimentary rock,
definition	:	rock formed from consolidated clay sediments (noun.substance)

hyponym	:	humic shale,
definition	:	shale that is rich in humic acids (noun.substance)

hyponym	:	oil shale,
definition	:	shale from which oil can be obtained by heating (noun.substance)