Re: Large animal extinctions - part 1

Thomas R. Holtz, Jr. (
10 Jul 1996 16:29:30 GMT

Dan Evens <> 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!)