"Geologically speaking," write the authors, "agate is not a particularly uncommon rock . . .. However, good agate – i.e, that which ancient lapidaries would have found suitable for beadmaking – is not widely available. Nodules of the size and quality required to make Harappan-style long-barrel carnelian beads are, in fact, extremely rare" (p. 177).

"Recent discoveries of Indus and Indus related materials at sites in the interior, and a general reassessment of comparable materials throughout Oman, suggest a more complex model of interaction. . . these artefacts probably reflect the presence of small groups of Indus merchants and craftspeople integrated into local communities and directly involved with important socioeconomic activities."

Harappa’s rock and mineral assemblage from the perspective of the greater Indus Valley’s complex geology, the distance one would have to travel to acquire certain materials and a discussion of the differing motivations behind the acquisition and transport of rock and minerals in the greater Indus Valley region.

The origins of manufacturing debris recovered from different periods of occupation between 3300 BCE and 1700 BCE at Harappa can now be identified with a high degree of certainty thanks to geologic source provenance studies.