All fossil tuxemon are Earth type. There are a number of possible explanations as to why:
- In prehistoric times, all or most tuxemon were Earth type. Other types evolved over time.
- While tuxemon of all types lived in prehistoric times, only Earth types were hard enough for their remains to be fossilised; the others decayed too quickly
- The process to bring back fossils does not replace the fossil, but includes it in the revived tuxemon. Since the tuxemon has rock parts, it has the Earth type.
- Being revived from fossils gives fossil tuxemon a spiritual connection to Earth.