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I think first era, because in this era there a lot of event happen that's why theres alot fossil will be found here in 1st era. :)

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What about the fact that the "simple" organisms are buried in the lower levels and the more "complicated" ones are buried in the higher levels? Doesn't this fact support the notion that simple organisms evolved into more and more complex organisms over time, with the more complex organisms buried and fossilized above the earlier and simpler life forms? Certainly this seems like a very logical assumption.  But, things just aren't that easy. There are a number of potential problems with this interpretation of the fossil record. For example, it is interesting to note that some general kinds of fossilized creatures are very generally found in the same relative vertical orientation, with respect to each other in the fossil record, that they would have naturally been found in during life. Single celled organisms make their first appearance in the lowest layers followed by multicelled ocean bottom-dwelling creatures like sponges and worms etc. Higher up come creatures like bony fishes, then land plants and animals, then birds and larger land animals.Of course, this is a very general pattern and does not explain why certain creatures that lived on the bottoms of oceans, like trilobites, make their first appearance in the Cambrian (505-540 Ma) while other creatures that live on ocean bottoms, like crabs and lobsters, don't appear until the beginning of the Cretaceous (65-145 Ma).83  Why would creatures that would seem to share the same general environment while alive be so widely separated in the fossil record if they did indeed live at the same time and in pretty much the same location? If the geologic column truly represents a series of closely spaced catastrophic burial events instead of long ages of time, how can this feature be explained?  Certainly this seems like a difficult and rather mysterious problem or those, like myself, who might think to question the long age notion of the fossil record. idont now its that is the answer
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