... use of bronze, the introduction of coinage, and the development of the simplified Persian cuneiform writing (never on tablets, only on stone monuments; see XV, Fig. 18). Bitumen ceased to be used as mortar in buildings. Persian walls (e. g. the Apadana at Babylon) are easily distinguished by the use of clay mortar, and the unusual thickness of the mortar-courses between the bricks. Burials in shallow trough-like pottery coffins, with the bodies at full length, but with the knees slightly flexed (these ... — How to Observe in Archaeology • Various
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