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Re: Large animal extinctions - part 1
Thomas R. Holtz, Jr. (th81@umail.umd.edu)
10 Jul 1996 16:29:30 GMT
Dan Evens <dan.evens@hydro.on.ca> wrote:
>
> Thomas R. Holtz, Jr. wrote:
> > Except of course the seafloor has been radar mapped so that most large
> > scale surficial structures are well resolved.
>
> Sonar? I did not think microwaves moved very well through sea water.
> I think it's sonar backed up by spot checks using other methods.
> Picky quibble I admit. The sea floor has indeed been mapped out,
> at least well enough to spot a km sized crater.
Sonar, of course (whoops!)
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