Slate rocks

(Min.) rocks which split into thin laminæ, not necessarily parallel to the stratification; foliated rocks.

See also: Slate

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The finder of the fossil was the partnership's own Ken Bradshaw, who said: "These marl slate rocks frequently show up mackerel type fossils and sections of fish and sometimes ferns and plant material.
Over time, the wind has eroded the landscape and converted the slate rocks into small fragments.