[stan_rogers]

Yes, but not all mammoths fossilize.

Fossilization is rare. Most deaths result in recycling the animal into nutrients for other things (animals, fungi and bacteria). For land animals, fossilization involves either dying under circumstances that are likely to promote fossilization or under circumstances that are likely to quickly move your body to a location that allows fossilization. Getting stuck in a quagmire or tar pit, or getting swept away trying to ford deep, fast-moving water drives your chances of fossilization up considerably.