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shales

  • plural
    of shale.
    shale
    noun
    a rock of fissile or laminated structure formed by the consolidation of clay or argillaceous material.

Example Sentences

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National Fuel Gas owns roughly 1.2 million acres in the Appalachian Basin, with substantial mineral ownership overlying the Marcellus and Utica shales.

From Barron's ● Jan. 23, 2026

But, this work is promising because it hints at the possibility that certain shales could be a lithium source that doesn't require new mines.

From Science Daily ● Apr. 15, 2024

"The oil shales are running out of Tier 1 inventory," said Bryan Sheffield, founder of energy investors Formentera Partners and Scott Sheffield's son.

From Reuters ● Oct. 11, 2023

Offshore shales may record how the islands’ volcanic basalt eroded.

From Science Magazine ● Apr. 13, 2022

The strata of the fourth series were characterized by carbonaceous shales or slates, containing remains of primordial vegetation, and perhaps equivalents of the first three calcareous series.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various