Supporters of the in situ theory believe that close to its present location organic matter accumulated near a peat bog and, shortly after burial, underwent permineralisation – minerals seeped into the organic matter and formed an internal cast.[8][9] Water with a high dissolved mineral content was buried with the plant matter in a peat bog. As the dissolved ions crystallised, the mineral matter precipitated out. This caused concretions containing plant material to form and preserve as rounded lumps of stone.