oolite

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oolite (ō´əlīt, ō´ō–), rock composed of small concretions, usually of calcium carbonate, containing a nucleus and clearly defined concentric shells. In the British Isles oolitic limestone is characteristic of the middle and upper Jurassic, which was formerly termed the Oolite on this account.

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oolite Commonly occurring limestone, consisting largely of ooids.

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oolitic Composed, or largely composed of ooids.