fossilized
fossil fuels
imprint
fossils
petrified wood
cement
limestone
fossil imprint
preserved to become a fossil.
is a fossil in which the organic remains have been replaced by minerals in the slow process of being replaced with stone.
a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.
a powdery substance made with calcined lime and clay. It is mixed with water to form mortar or mixed with sand, gravel, and water to make concrete.
a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
impress or stamp (a mark or outline) on a surface.
are the remains and traces of ancient organisms.
are formed from an organism moving in some way, leaving behind a trace or track. These tracks are preserved when the clay/silt dries slowly and is covered by other sediment.
