Fossil Island fossil

Fossils are items on Fossil island that are used to earn kudos for the Varrock museum, are sold to the Fossil Collector for nummulites, in the case of rare fossils, may be used for a small prayer bonus via rare enriched bones.

Strategy
This guide makes the assumption that an unidentified large fossil will turn into a large fossil % of the time, and a plant fossil % of the time.

In order to complete the Varrock museum, you will need approximately unidentified large fossils (for 25 large fossil pieces and 25 plant fossil pieces), 60 unidentified medium fossils and 70 small fossils. The rate-limiting step are the unidentified large fossils.

* Extremely click-intensive - 3000 is the theoretical maximum with mousekeys

Thieving and Marim's Market
If you are using Mairin's Market, to get the exact amount of medium fossils as well as large fossils at the same time, you would have to buy large fossils, taking  hours, at which point on average you would need to gain an additional  large fossils and  medium fossils. However, you should at this point evaluate the specific fossils you need to achieve your total of 25 plant fossils, 25 large identified fossils and 60 medium fossils.