What are index fossils and how are they used for relative dating

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Kan maneter bli fossil??? Ja, det kan de faktiskt!! Nedan ett fossil av en manet från karbontiden. FossilFriday When we think of fossils we think of bones, shells, or maybe teeth, as it is incredibly hard to preserve tissues from decomposition and, of course Think how many jellyfishes are there in the ocean, yet very few of them are preserved in the fossil record.

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Among the reasons are soil erosion caused by water, wind and irrigation, the salinization of soil, intense bioresources usage, and soil pollution due to oil extraction and production.

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