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Sedimentary rocks (made from mud, sand, gravel or fossil shells) and volcanic lava flows are laid down in layers or beds.They build up over time so that that the layers at the bottom of the pile are older than the ones at the top.Most fossils are bones or teeth due to their relative hardness. Most of these organisms are very small, like insects, and need to be completely enclosed in a substance like tree sap (like in the movie ), a tar pit, or water that turns to ice.Finding complete fossils like this is even rarer than finding parts of organisms.The geological time scale is used by geologists and paleontologists to measure the history of the Earth and life.It is based on the fossils found in rocks of different ages and on radiometric dating of the rocks.

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In fact, the very concept of strata representing long ages does not come from the rock strata themselves.The dead organism needs to be buried under sediments and have a lot of pressure put on them.The pressure cements the sediments together and then as they dry out, a sedimentary rock forms around the fossilized part.Fossilization usually can only happen to hard parts of the organism's body, so that is another obstacle in the way of making fossils.It is possible that some traces of organisms, like footprints, can become imprint fossils if they are filled with sediments, but these are rare. That organism normally needs to be near an area with a lot of water, like a lake or river.

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