Limestone: a terroir factor

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The standard

An evidenced soil effect traces an impression in the wine back to a demonstrable property of the soil, such as water storage.

Criteria

The property of the rock is named, not just its name
Its influence on water or heat is describable
The effect runs through the vine, not as a direct taste
It holds for the parcel, not for the region at large

Distinction

Limestone ≠ soil profile: the limestone is a single factor, the soil profile the whole layering of a parcel. Limestone ≠ terroir: the evidenced soil effect of a rock is a component of terroir, not terroir itself.