Fossil _ What constellation is fossil?

How are fossils formed? Conditions for the formation of fossils.

Formation conditions:

It refers to the remains, relics or remains of paleontology preserved in the stratum and buried underground, which are changed by natural action, and keep the calcification, carbonization, silicification and mineralization of the original objects, structures or impressions.

In the long geological age, countless creatures lived on the earth, and many of their dead bodies or traces left by life were buried by the sediment at that time.

In the following years, the organic matter in these biological remains was completely decomposed, and the hard parts, such as shells, bones, branches and leaves, together with the surrounding sediments, were petrified into stones, but their original forms and structures (even some subtle internal structures) still existed; Similarly, the traces left by those creatures when they are alive can be preserved in this way.

The formation and preservation of extended data fossils are mainly related to the following conditions:

1. Whether organisms have hardware (such as shells and bones) made of chemically stable substances, it is more likely that organisms with hardware will be preserved as fossils;

2. Whether the physical and chemical conditions of the environment where the biological relics or relics are located are suitable for preservation, and whether the water environment with strong wave action is not conducive to the preservation of biological relics or relics; When the PH value of environmental medium is less than 7.8, the biological hardware composed of calcium carbonate is easy to be corroded, which is not conducive to the preservation of biological relics. Oxidation conditions are not conducive to the preservation of organic matter;

3. Whether organisms are buried quickly after death, if their remains can be buried quickly and for a long time after death, it is easier to form fossils.

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