Tephra is dust sized particles found along the banks of River Kukadi. It was derived from a supervolcanic eruptions that took place thousands of years ago. The particles emanated from the volcano Toba in Sumatra, Indonesia. It travelled 3,000km through the atmosphere before settling down as sediment layers in Maharashtra. The local villagers have been fighting to preserve the deposits from sand mining activities and also the erosional action of the natural elements.