Re: Chinese Boid Watching...

["Allan Edels" <Edels@email.msn.com>]

ALL:

    Some time ago, Josh Smith gave a radiometric date of the Sihetun
deposits at 121.2 mya.  The only ones who insist the deposits are 150-140
mya are the Chinese, because some of them feel that it would be best if
their fossils were _Archaeopteryx_-aged, not younger.  Personally I feel
that the fossils are special without being as old or older than
_Archaeopteryx_.

        Allan Edels

-----Original Message-----
From: Dinogeorge@aol.com <Dinogeorge@aol.com>
To: sarima@ix.netcom.com <sarima@ix.netcom.com>; dinosaur@usc.edu
<dinosaur@usc.edu>
Date: Sunday, June 06, 1999 7:45 PM
Subject: Re: Chinese Boid Watching...


>In a message dated 6/6/99 6:08:42 PM EST, sarima@ix.netcom.com writes:
>
><< Is this solid enough to settle the controversy over the dating of these
>faunas?
>
> Or is there still enough uncertainty to allow some to continue to claim a
> Late Jurassic date for them? >>
>
>Don't think there's much if any support remaining for a Late Jurassic date
>for these faunas. These radiometric dates are >well< into Early Cretaceous,
>by around 20M years.
>