The credit for doing early extensive study of prehistoric Karnataka goes to Robert Bruce-Foote and this work was later continued by many other scholars. The pre-historic culture of Karnataka (and South India in general) is called the hand-axe culture, as opposed to the Sohan culture of North India. Paleolithic hand axes and cleavers in the shape of pebbles made with quartz and quartzite which have been found in places such as Lingadahalli in Chikkamagaluru district and Hunasagi in Yadgir district, and a wooden spike at Kibbanahalli in Tumkur district are examples of old Stone Age implements. There are reports that a polished stone axe was discovered at Lingasugur in the Raichur district Neolithic sites (new Stone Age) of importance are Maski in Raichur district, Brahmagiri in Chitradurga district etc., with abundance of evidence that man begun to domesticate animals such as cows, dogs and sheep, use copper and bronze weapons, wear bangles, rings, necklaces of beads and ear-rings and have burial chambers. To the end of the Neolithic era, during the Megalithic age, people in Karnataka began to use long swords, sickles, axes, hammers, spikes, chisels and arrows, all made of iron.