Fossil records tend to hard to interpret because they are vague. A fossil can only form if the organism or animal had a skeletal body. If the organism doesnt have a skeletal body then there wouldn't be a fossil since the parts that form a fossil are usually the bones or hard and solid parts of the body that dont decompose over time. Also many things that happen in nature can damage the fossil making the record incomplete, and though it still gives us some information about the creatures that existed on earth long before us sometimes it is useless. This makes fossil records are hard to explain because so many of the other fossils are lost or have been erased from the face of the earth by erosion and even becoming the sediments. Not only that fossil dont give us that much information about the organism. Fossils give us information about what the organism may of looked like as in shape and size but how about what color their skin or fur looked like? Fossils have no way of telling us about that. In addition there is also that problem of whether the fossil is real or not. Whether the fossil has reached all the requirements of being a fossil, like being old enough.http://en.wikipedia.org/wiki/Fossil
http://hoopermuseum.earthsci.carleton.ca/evolution/g.html
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