The Utica Shale, a stratigraphical unit of Middle Ordovician age that is potentially rich in shale gas reserves, underlies the Anticosti Islands and extends to surrounding areas in Quebec, Ontario and much of northeastern United States. On February 8, 2011, the citizen group "Non au Pétrole et au Gaz au Québec" released one of the biggest petitions in Quebec history against fracking in the province of Quebec with 128,000 signatures thinking it would prevent the oil and gas exploration on Anticosti. In June 2011, the Quebec firm Pétrolia claimed to have discovered about 30 billion barrels of oil on the island of Anticosti, which is the first time that significant reserves have been found in the province.