thank you, i appreciate the time you took with this....my position is simply that scientists have hypothesis based upon how they assimilate/interpetate the 'evidence'....you may well be right, and the sheet may actually have been a mile thick...the point is though that much of science is hypothetical....for instance, when i was in grade school (oh...back in the late 60's/70's) the dinosaur 'family' was about 20 or so, there was the tyrannosaur, stegosaurus, brontosaurus...etc, etc,..all in drab grey, now there are literally hundred's of them, and the discover channel has an entire season devoted to 'walking with dinosaurs'...it's neat for kids as a fiction, which is what it is, but the dc makes out what they narrate as fact....and also dinosaurs now are all colors of the rainbow, there's no evidence they are anything but grey, but it makes for good tv.....point of fact is that we make a lot of conjecture, not always on evidence (ie 'lucy', as you probably know), and we preach it as fact, when it's as phoney as a three dollar bill.....
I know what you are saying.
Until a new scientist disproves it....