Petroleum Sporo-pollen Assemblages and Petroleum Source Rocks of North Tarim Upheaval in Xinjiang Palynological Evidence for the Tertiary Petroleum Source of the Qaidam Basin Palynological Evidence for Jurassic Petroleum Source of Qaidam Basin Spores and Pollen from Crude Oil of Kashi Depression, Xinjiang Spores and Pollen from Crude Oil of Dushanzi Oilfield in Xinjiang