An unidentified rare fossil is a fossil that can be obtained while performing activities on Fossil Island, including:
- Obtaining one as a drop from monsters on the island.
- Chopping Sulliuscep mushrooms in the Tar Swamp.
- Tracking a herbiboar's tracks in the Mushroom Forest.
- Looting giant clam shells and treasure chests underwater.
- Purchasing one from Mairin in her shop for 100 mermaid's tears.
- Mining the boulder while in the Volcanic Mine.
- Looting drift nets
- Digging in the soil at the Museum Camp
- Opening a Bowl of fish
They can be traded to the Fossil Collector in exchange for 500 numulites.
Cleaning[]
Before players can clean fossils, they must build the cleaning bench east of the Museum Camp using five planks and five nails, granting 100 Construction experience.
To clean fossils, players must use the unidentified fossil on the fossil cleaning bench while wearing leather boots and leather gloves and in possession of a trowel, rock pick and specimen brush. Players can also clean fossils at the specimen table in the Varrock Museum.
Cleaning unidentified rare fossils will give the player a rare fossilised limbs, spine, ribs, pelvis, skull, or tusk.
Dropping monsters[]
See Fossil Island fossils for strategies on obtaining fossils.
Monster Combat level Quantity Rarity Deranged archaeologist 276 1 Rare (3/875; ~0.34%) Ancient Wyvern 210 1 Rare (3/875; ~0.34%) Spitting Wyvern 139 1 Rare (1/350) Taloned Wyvern 147 1 Rare (1/350) Long-tailed Wyvern 152 1 Rare (1/350) Ancient Zygomite 109 1 Rare (1/500) Lobstrosity 68 1 Rare (1/700) Tar Monster 132 1 Rare (1/700) Hoop Snake 19 1 Very rare (3/3500; ~0.086%) Ammonite Crab 25 1 Very rare (3/3500; ~0.086%)
| Small | |
| Medium | |
| Large | |
| Plant | |
| Rare | |
| Unidentified | |
