Cuneiform inscriptions and bas-reliefs have been found at the sources of both the western and eastern Tigris, as well as at various points on the cliffs along the upper course of both branches.
The bronze doors, adorned with bas-reliefs, are good; they may belong to the beginning of the 13th century.
By the forms of the letters of the inscriptions, and by the architectural details, the age of the monument has been approximately fixed in the 3rd century B.C. The bas-reliefs give us invaluable evidence of the literature, and also of the clothing, buildings and other details of the social conditions of the peoples of Buddhist India at that period.
These are, as a rule, quite unadorned, a few only being decorated with rude bas-reliefs of animals, plants, weapons, the crescent and star, or, very rarely, the cross.
The rock bas-reliefs and other monuments showing native divinities are rare, and give only very summary representations.