History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c29.s2.t1.2

v1.c29.s2.t1.2

*Harappan:* Though man came in contact with stone in pre-historic times its earliest systematic use in India came around Harappan times when massive rough stone walls of unhewn stone were raised. Sometimes these are ten to fifteen feet high. These were built across the course of seasonal streams apparently as a crude effort intended to conserve an intermittently abundant flood water.