Teeth are usually preserved without much change as they are harder than the bones and contain fewer tiny spaces. Aren't some plant fossils only imprints of plants? Jellyfish or other soft bodied animals and plants may be preserved as imprints fossilized over time. However, some of the original leaf substance may be left in the form of a brown or black film of carbon...
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This process is called carbonization. Other interesting footprints are footprints and trails of certain animals. Dinosaur tracks have been found in various places. Sometimes, footprints and tracks get wiped out by wind and rain. But in some cases the footprints made on soft clay which later dried up and got covered by layers of fresh sediment and was thus preserved and later turned into sedimentary rock...
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Dinosaurs The large sauropods began to appear and replace the smaller plateosaur plant eaters. In the meat eater category, dilophosaurs stayed alive and healthy until an extinction event occurred about half way through the Jurassic...	3 / 669
The Dinosauria Dimetrodon is neither a reptile nor a mammal, but a basal synapsid, i.e., an early relative of the ancestors of mammals. ? Not all dinosaurs lived at the same time...	2 / 425
Dinosaurs In recent years several different lines of evidence have been interpreted as indicating that dinosaurs may have had warm blood and high rates of metabolism, comparable to birds and mammals...	3 / 719
dinosaurs They dominated the planet when they existed; they were huge prehistoric animals that weighed tons of pounds. Dinosaurs are a big part of the world's culture today, because they have been featured in many movies for example, a movie called Dinosaurs, which is a Walt Disney movie that was released on May 19, 2000...	4 / 910