Imbricate aestivation

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The American arborvitae tree has simple, scale-like imbricate leaves

in four rows.

No. Darwin originally listed it as active on his voyage on the Beagle, but the mountain is not volcanic and its height results from imbricate thrust faulting, or in simpler terms, gradual tectonic plate activity.

Imbrication is the arrangement of surface components. A tile roof would be considered imbricated. The arrangement of flattish stream boulders would be called imbricated, and may indeed indicate the water flow direction from which they were deposited.