Technically, woolly mammoths didn't fossilize because the ice preserved them so well. Their bones are actually fully intact, unlike dinosaur fossils whose bones turned to stone over time.
Mammoth ivory is often sold in place of banned elephant ivory. Mammoth tusks are highly regarded as objects of wealth.
One of the most remarkable aspects of woolly mammoth fossils is that their hair (or fur) is often preserved. Mammoths were unique in that they had long, dark, full hair that covered their entire bodies.
Woolly mammoths became extinct approximately 10,000 years ago. Many of the animals froze in ice, which preserved their remains.
The most well-preserved woolly mammoths have been found in Siberia, but the animals also roamed parts of North America and Eurasia.