Fossils

Fossils can be created by letting creatures harvest Amber, which is harvested from Sinkholes.

Starting at level 4, Fossils can occasionally be tapped for a Level 1 Cocoon.

Sometimes, when merging level 3 or higher Fossils in groups of 5, a Fossilized Remains will be created as a bonus item. The Fossilized Remains given as a bonus are the same level as the merged Fossils, and so one level lower than the resulting Fossils it spawns with.

Starting at level 8 fossils begin to hold 2 Cocoons to be collected occasionally.

Keeping a large number of Fossils on the map to create and merge Cocoons to, in turn, create Didosaur is a good earlier game source of slow but consistent Creature Power.

Object information
There are currently 12 different levels of Fossils, with level 12 being a wonder.