The importance of the fossils and the suitable conditions for the fossils formation

The suitable conditions for the fossils formation

The organism body must be buried immediately after death in a medium that preserves it from the decomposition ,  The organism must have hard skeleton , The suitable medium must be found in which the mineral material replaces the organic material of the living organism .

The importance of the fossils

The fossils help in studying the life evolution which is known by the fossil record , The fossils exist in the rocks of the different areas . And the fossil record  indicates the extinction and the evolution of the organisms .

Studying the fossil record showed that the life started first in the sea , then established on the land . The organisms always developed from simple to complicated as :

The archaeopteryx fossil
The archaeopteryx fossil is considered a link between the reptiles and the birds .

The fish were the first vertebrates that appeared , followed by the amphibians , then the reptiles , and finally the birds and the mammals appeared together .

The invertebrates ( such as the coral and the mollusks with the shells ) appeared before the vertebrates .

The algae appeared before the mosses and the ferns . The angiosperms appeared before the gymnosperms .

The fossils help in the age determination of the sedimentary rocks , And you know that the index fossils indicate the age of the sedimentary rocks , Because the age of the rocks is the same age of the fossils existed in them .

The fossils
The fossils help in the age determination of the sedimentary rocks .

The index fossils are the fossils of the organisms that had lived for a short period of time in the past , and had a wide geographic distribution , then became extinct .

The fossils help in the petroleum exploration  . You know that the geologists take the samples from the rocks of the exploratory wells , when they search for the petroleum .

The fossil fuel formation
The fossils help in the petroleum exploration .

These samples are studied under the microscope , And if they contain microfossils like the foraminifera and the radiolaria  , They will point to the age of the rocks existed in the exploratory wells , and the suitable conditions for the petroleum formation .

The fossils help in figuring out the paleoenvironment . The fossils give an idea about the environment in which they lived during the old geologic ages , and also they indicate the climate of these ages .

The coral fossils indicate that the environment where they live was clear warm shallow seas .

The ferns fossils indicate that the environment where they lived was a hot and rainy tropical environment .

The nummulites fossils are found in the limestone rocks of Gebel El-Mokattam , and indicate that this area was a sea floor more than 35 million years ago .

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