simple past tense and past participle of shale

plural of shale

Third-person singular simple present indicative form of shale

A shell or husk; a cod or pod. / (geology) A fine-grained sedimentary rock of a thin, laminated, and often friable, structure.

To take off the shell or coat of.

present participle of shale

Natural gas extracted from shale.

A synthetic crude oil obtained by the pyrolysis, hydrogenation, or thermal dissolution of oil shale. / A crude oil obtained from low permeability petroleum-bearing formations (shales).

A sedimentary rock containing kerogen from which petroleum-like shale oil can be produced by pyrolysis, hydrogenation, or thermal dissolution.

A rock formation in the Canadian Rockies that contains very many fossils from the Cambrian period.