Lewisian gneiss is metamorphic rock, which means it was formed by being heated up and ... They saw a 240-million-year-old rock formed in the Triassic Period, a granite and a glacier erratic – a rock ...

Geologists point out that the soil in Bengaluru, Mysuru, and surrounding areas is silty and red, and the region is made up of metamorphic granite rock called Peninsular Gneiss. “The soil is not ...