Definition of "upthrown" [upthrown]

• Past participle of upthrow (verb)

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• "Where there were no upthrown mounds of gravel, great holes and trenches yawned, and chasms where the thick rime of the earth had been peeled to bed-rock."
• "Lake Victoria is relatively young; its current basin was formed only 400,000 years ago, when westward-flowing rivers were dammed by an upthrown crustal block."
• "The scanty growth paused abruptly half – way down the gulf, and the rock below was perpetually damp from the upthrown spray."