Linc Energy claims to have found rock formations containing more than $20 trillion worth of oil Brisbane company Linc Energy says independent studies have confirmed a major shale oil source in South Australia's far north, which officials have estimated could be worth $20 trillion. The company says U.S. consultants have carried out drilling and geological and seismic surveys around Coober Pedy. Linc Energy holds rights over more than 65,000 square kilometres of land in the Arckaringa Basin and started explorations in 2008. In a statement to the Stock Exchange, the company said reports from U.S.-based consultants indicate underlying rock formations...