The Acasta Gneiss, a metamorphic rock, is 3.96 billion of years old.

Granite is not the oldest rock in the world. The oldest rocks on earth are gneiss, particularly the Acasta Gneiss and are about 4. 09 billion years old.

It is located in the Northern Territories, Canada. If location is what you mean by area.

To my knowledge it is the oldest rocks on Earth, formed at the end of the Hadean, some 4.01 Ga. It is highly deformed (20 km2) tonalite and granodiorite associated with amphibolite and ultra-mafic rocks, all lithologies are juxtaposed by high stress in banded rocks.

Gneiss is foliated.

A Gneiss is a Metamorphic rock