1. Genesis 11:3 (ESV)
  2. Exposition

Why did the people not use stones?

Genesis 11:3 (ESV)

3 And they said to one another, “Come, let us make bricks, and burn them thoroughly.” And they had brick for stone, and bitumen for mortar.

Stones, which the Egyptians used for their temples, palaces, and pyramids, were not available except by transport over a long distance.