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The carbon isotope δ13C value of dispersed organic matter in the Upper Triassic sediments in the Ordos basin is (-24.5 to -26.6) ×10-3 with the carbon being derived from C3-1ike pleustons.The paleoclimate of the Late Triassic, especially during the deposition of the Chang 7 member, was characterized by a hot and humid climate. It underwent four small climate cycles from humid and warm to humid and hot.