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wouldn't the actual quality of sediments change with location and
I understand that the Yellow river in China has been regarded as a VERY
high-sediment river, whereas a similarly sized river such as the
Mississippi may not carry the same multi tons of sediment as
So could you count on different rivers having the EXACT same
preservation qualities? A river with more floating crud in it would
seem more likely to preserve little vertebrate things than a river with
less floating crud in it.
"Jaime A. Headden" wrote:
> This suggests, but does not constrain, the idea that
> the Nemegt had best be mapped in all its braided and
> not complexity before attempting an ecological
> perspective or preservational consideration on the
> I'm not up on the chemical taphonomic processes, so
> couldn't comment on that; particulate matter requires
> mass and velocity stuidies in streambeds, and this
> requires getting out and measuring ripple depth and
> length, and bed width, and depth, and as far as I can
> tell, there are no such beds available in the Nemegt.
> Further, sediment particulate size maps have also not
> been carried out. So this is an unknown.
Flying Goat Graphics
(Society of Vertebrate Paleontology member)