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Describe The Conditions Under Which Fossils Form

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Describe The Conditions Under Which Fossils Form
8.4 - Life on Earth:
Prerequisite Knowledge: • Discuss evidence that present-day organisms have developed from different organisms in the distant past: ­ Comparison of the physiology of fossils to present day organisms have showed relationships between the organisms ­ The examination of the DNA structure of organisms has shown the development from past organisms. • Describe the conditions under which fossils form: ­ Fossils are any remains of past life found in rocks of different ages ­ Fossilisation is a rare event ­ For fossilisation to occur, the following events must happen: ▪ Quick burial in soil, sand or mud, or in tree sap or ice ▪ Prevent decay ▪ Organism lies undisturbed ­ Complete fossils are only very rarely found …show more content…
This was at North Pole Dome |Antarctica |
|+ Stromatolites were found in the layered rocks |Hot Springs |
|+ These were very similar to the hot-spring stromatolites found. |High alkaline lakes |
|+ Geologists find bacteria in the superheated vents of mineral |Lake Clifton WA |
|waters up to 150ºC |+ Stromatolites are now in danger of extinction due to rising |
| |nutrient levels due to fertilisation. Rise in competition |
| |+ This possibly happened in Precambrian times
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