The sims 3 cc dinosaur9/13/2023 ![]() The Tuchengzi Formation tuff gave a mean age of 139.4☐.19 (1SD)☐.05 (SE) Ma. Single sanidine crystal total fusion 40Ar÷39Ar analyses of the Hengdaozi tuff gave a mean age of 125.0☐.19 (1SD)☐.04 (SE) Ma, which is indistinguishable from the Sihetun Single crystal total fusion 40Ar÷39Ar analyses of the Sihetun sanidine showed homogeneous radiogenic Ar, Ca÷K ratios, excellent reproducibility and gave a meanĪge of 125.0☐.18 (1SD)☐.04 (SE) Ma. The upper part of the underlying Tuchengzi Formation. The third tuff is a previously undated tuff from to be unaffected by metamorphism and whose age, based on total fusion 40Ar÷39Ar dating of biotite, argues for a Jurassic age for the Yixian Formation. The second is the Yixian Bed 9 tuff from Hengdaozi consideredīy Lo et al. Tuff from the Yixian Formation, previously dated by our team as middle Early Cretaceous, and recently considered by Lo etĪl., partially reset due to metamorphism from a nearby basaltic sill. ![]() The first is a new sample of the Bed 6 Sihetun Interbedded within the fossil-bearing deposits of Liaoning, northeast China. We report new 40Ar÷39Ar dating results obtained from total fusion and incremental-heating analyses of sanidine and biotite from three tuffs found
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