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Re: Dating the Jiufotang and Jehol Biota

> We recently carried out a combination of Ar-Ar dating and paleomagnetic
> investigation on the Sihetun section in West Liaoning in purpose to
> attest the age of the famous fossil assemblage. The datings on the lower
> and upper volcanic rocks yielded ages of 126.5+/-1.4 Ma and 124.5+/-1.5
> Ma, respectively.

Both dates overlap the range for the Barremian-Aptian boundary according to
http://www.stratigraphy.org/gssp.htm, 125.0 +- 1.0 Ma ago.