Plant fossils are items used in reviving prehistoric plants. It can be dropped by a fossil block or produced while sifting. They follow a similar method to bio-fossilsin producing living plants. When placed in an analyzer, plant fossils can produce fossilized seeds and spores and petrified palaeoraphe saplings, which function like DNA and get put in the culture vat. Other items that can be yielded by the analyzer is coal, sand, and cactus green.