Sentence:  The division of the field into an upper and lower <WSD>register</WSD>, with decorative motifs in the upper <WSD>register</WSD> and a scene with figures in the lower <WSD>register</WSD>, as here, is, as has been mentioned, characteristic of Syrian seals from the early second millennium. 
Meaning of the word marked with <WSD> tags:  A distinct horizontal (or, more rarely, vertical) section of a work of art or inscription that is divided into several such sections