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zone

1. n. [Geology]

An interval or unit of rock differentiated from surrounding rocks on the basis of its fossil content or other features, such as faults or fractures. For example, a fracture zone contains numerous fractures. A biostratigraphic zone contains a particular fossil or fossils.

2. n. [Well Testing]

A slab of reservoir rock bounded above and below by impermeable rock.

See: layer

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