The significance is that in the Standard Model of Indian history, civilization in India begins with Mehrgarh, which is to the west of the Indus, and the Gangetic plains civilization only started much later.
Do you know that Uttar Pradesh site of Chopanimando has a pottery earlier than Mehrgarh?
Yes. Chopanimando, located at the Belan river, near confluence of Ganga and Yamuna in its phase of "Advanced Mesolithic" presents "dull red and brown grey wares" (Fuller 2005: 330) at the level also called Chopanimando III (see also Pal 1986). Fragments of this pottery were dated 8080 +- 115 BC with wild rice grains impression (Sharma et al. 1980).
This means that Chopanimando's pottery is more than 2500 years older than Mehrgarh's pottery which starts around 5500 BC.
This comes to support other early pottery dates at UP, like Lahuradewa of 6200 BC, and sites like Baghai Khor, Lekhahi III-IV,
Ghagharia, and Morahana Pahar (Fuller, Ibid.).
Dorian Fuller recognized this antiquity also in a personal communication: "...in other areas like Lahuradewa ceramics have
thousands of years of earlier history, which is also suggested by Chopanimando..." (pers. com. e-mail 22-Feb-2005).
2009-06-18: Please note Carlos Aramayo's correction in the comments.