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A combined paleomagnetic and geochronological study is reported of Paleogene basalt lavas and an intercalated red bed succession, comprising a minimum of 14 basalt flows and 10 red bed horizons in the Tuoyun Basin of the southwest Tian Shan Range, China. Two basalt matrix samples yield 40 Ar/ 39 Ar isochron ages of 58.5±1.3 Ma (2σ, MSWD=0.9) and 60.4±1.3 Ma (2σ, MSWD=1.7). These compare...
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