A fossil is found that shows the organism that produced it had a skeleton and also suggests that the organism may have had hair covering it's body. Based on this evidence, it can also be assumed that the organism is a member of the domain

The Domain Archaea wasn't recognized as a major domain of life until quite recently and,

The Eukaryota Domain include the organisms that most people are most familiar with - all animals, plants, fungi, and protists and animals have hair and skeleton.