my grams used to write notes on leaves for me, and leave them in her garden to find. they always said something along the lines of ‘you are loved’ and ‘you are beautiful and always will be’. she used to say that the fairies left them, and i used to nod, but hugged her extra tightly.
For wood to become petrified, the wood must first be covered with such agents as volcanic ash, volcanic mud flows, sediments or material washed in by violent floods - by any means which would exclude oxygen and thus prevent decay. A number of mineral substances can cause wood to petrify, but by far the most common is silica. Solutions of silica dissolved in ground water infiltrate the buried wood and through a complex chemical process are precipitated and left in the individual plant cells. Here the silica may take a variety of forms; it may be agate, jasper, chalcedony or opal. The beautiful and varied colors of fossil wood are caused by the presence of other minerals that enter the wood in solution with the silica.