Shale was a fine-grained form of rock.

Shale was used as slang term for a lie or perceived falsehood. The word was often used by the Human descendants of the Terra Nova colony. (ENT: "Terra Nova")

Some hills on Capella IV were composed of shale. In 2267 James T. Kirk and Spock used their communicators to create a sonic disruption which toppled a rock face comprised of shale. The rocks collapsed, blocking the entrance to a canyon and making it more difficult for Kras and a group of Capellans to reach Kirk and his party. (TOS: "Friday's Child")

In 2371, Neelix talked with Jetrel about the Talaxians on Rinax who survived the metreon cascade. He described the flesh of the survivors as "horribly charred, the color of shale." (VOY: "Jetrel")

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