Period of Indus Valley Civilization

Scholars have different views regarding the age of Indus Valley Civilization.

1. In the view of Sir John Marshall, the Indus Valley Civilization existed in about 3250-2750 B.C. 
2. Mackey takes it as between 2800-2500 B.C.
3. Madho Swaroop Vats says that this civilization existed between 3500-2700 B.C.
4. Rajbali Pandey considers Indus Valley Civilization to be of around 4000 B.C.
5. Albright holds the view that civilization existed in around 1750 B.C.
6. Allwyn is of the opinion that the Indus Valley Civilization existed between 2150-1750 B.C.

Various scholars mention different ages of Indus Valley Civilization, yet it is certain that this civilization is one of the most ancient civilizations of the world.