It is believed that tribes of Austric origin like "Kols", "Mundaris", "Kharvis" may have settled Goa and Konkan during the Neolithic period, living on hunting, fishing and a primitive form of agriculture since 3500 BC. According to Goan historian "Anant Ramakrishna Dhume", the Gauda and Kunbi and other such castes are modern descendants of ancient Mundari tribes. In his work he mentions several words of Mundari origin in the Konkani language. He also elaborates on the deities worshiped by the ancient tribes, their customs, methods of farming and its overall impact on modern day Konkani society. They were in a Neolithic stage of primitive culture, and they were food-gatherers rather. The tribe known as the "Konkas", from whom is derived the name of the region, "Kongvan or Konkan" with the other mentioned tribes formed reportedly the earliest settlers in the territory. Agriculture was not fully developed at this stage, and was just shaping up. The Kols and Mundaris might have been using stone and wood implements as iron implements were used by the megalithic tribes as late as 1200 BC. The Kol tribe is believed to have migrated from Gujarat. During this period worship of mother goddess in the form of anthill or "Santer", was started. Anthill is called as "Roen" (Konkani:रोयण), this word has been derived from the Austric word "Rono" meaning with holes. The later Indo-Aryan and Dravidian settlers also adopted anthill worship, which was translated to "Santara" in Prakrit by them.