Here's a lovely list of transitional fossils that have been found for you guys to peruse...
Page Not Found - HolySmoke!
There is also quite a lot of luck involved for a fossil to form form in the first place. It's quite reasonable to expect there to be very large gaps in the fossil record.
quote:
It isn't easy to become a fossil. The fate of nearly all living organisms - over 99.9 per cent of them - is to compost down to nothingness. When your spark is gone, every molecule you own will be nibbled off you or sluiced away to be put to use in some other system. That's just the way it is. Even if you make it into the small pool of organisms, the less than 0.1 per cent, that don't get devoured, the chances of being fossilized are very small.
-
A Short History of Nearly Everything by Bill Bryson