|Hardness||0 (Not mined directly)|
|Value||3 per unit|
Alien Fossils are a secondary mission objective. They can appear in any gamemode. To be gathered, dwarves must be close enough to pick them up with the [USE] key ("E" by default). 10 must be collected to complete the secondary objective. Completing the objective gives 900 and 200 , both affected by Hazard Bonus.
Alien fossils appear as a fossil of a creature that seems to resemble an Ammonite, embedded in brown rock. The "creature" on the fossil can also be seen in the dark, although barely.
Fossils can be found in any environment. They stick to walls and ceilings, sometimes making their collection difficult.