Cylinder seal and modern impression: male worshiper; dog surmounted by a standard; Kassite; ca. mid-2nd millennium B.C.; Mesopotamia; Kassite; Carnelian; 0.97 in. (2.46 cm); Stone-Cylinder Seals-Inscribed; Although engraved stones had been used as early as the seventh millennium B.C. to stamp impressions in clay; the invention in the fourth millennium B.C. of carved cylinders that could be rolled over clay allowed the development of more complex seal designs