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The subjective evidence of feathered dinosaurs is widely promoted by the science media.

The Jehol Group consists of the Jiufotang and Yixian formations, which outcrop in southeastern Inner Mongolia, western Liaoning and northern Hebei provinces of China.

The Jehol Group strata are extensive with the lower Yixian Formation being 4,700 m at maximum thickness and the higher Jiufotang Formation being a maximum of 1,650 m.

In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.