Fossil

Fossils are naturally occurring objects. They appear in the background walls, and you can excavate them with tools crafted at Fossil Station, such as Basic Fossil Brush.

This is vanilla mechanic, see vanilla wiki for details: https://starbounder.org/Fossils

Fossil-related changes in FU
In FU:
 * you receive more loot if a fossil is successfully excavated.
 * successfully excavating a fossil always yields Research Data.
 * failing to excavate a fossil will yield some Bone.
 * there are more fossils, including 4 "extra large" fossils (for X-Large Fossil Display).
 * there are two more brushes: Fossil Hammer (provides the excavation mini-game with imprecise but powerful instruments) and Microparticle Brush (even more precise than Master Fossil Brush, which was the best brush in vanilla).