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Re: Paleocene Dinosaurs
Tomporowski, Steve wrote:
> Is there any evidence
> of dinosaur survival past the K-T line?
As I understand it, dinosaur material discovered above the K-T boundary
has consisted mainly of unassociated bone fragments and teeth preserved
in fluvial channel deposits.
The problem with channel deposits is that a
stream will transport (1) remains of recently-dead animals AND (2)
previously buried (sometimes already fossilized) remains derived from the
older deposits which the stream is eroding. Thus the presence of
unassociated, disarticulated dinosaur bits in Paleocene stream deposits
does not necessarily mean that dinosaurs survived into the Paleocene, but
only shows that the Paleocene stream eroded Mesozoic strata and picked up
some dinosaur bones/teeth in the process.
Now, if someone were to find some nice, articulated dino material in
Paleocene strata, that may be cause to start thinking about survival
Allison R. Tumarkin
Dept. of Geology
University of Pennsylvania