What conditions are required for fossil formation? Is there a time requirement for how many years si

Not necessarily, the bones turn to stone after a long time.

It takes hundreds of millions of years for fossils to form. The so-called fossils refer to the paleontological relics and living relics preserved in the geological history period in the rock formations, as well as the residual organic molecules of biological origin, which are paleontological remains, relics or relics. The most common are bones and shells.

To put it simply, fossils are the remains or remains of organisms that lived in the distant past"Stones"。Many were buried by the sediment of the time.

In the long geological time, there have been countless creatures living on the earth, and many of the remains of these creatures after death or traces left over from life were buried by the sediment of the time. In the years that followed, the organic matter in the remains of these creatures was decomposed, and the hard parts such as the shells, bones, branches and leaves, along with the surrounding sediment, were petrified and turned into stone, but their original form and structure remained.

In the same way, the traces left by those creatures when they lived can be preserved in this way. We call the remains and remains of these petrified organisms fossils, and fossils generally take at least hundreds of millions of years to form.

Plant fossils include roots, trees, leaves, seeds, fruits, pollen, spores, phytolites, and amber. Fossil terrestrial plants have been found on land, in lakes, in rivers, and in offshore strata. The earliest fossils that can be definitively classified in the plant kingdom are the fossils of green algae in the Cambrian period.

Common fossils include bone fossils and shell fossils, as well as trilobite fossils, fish fossils, and footprint fossils, which have great scientific research value.

1. Academics generally refer to biological remains more than 10,000 years old as fossils. Even if there is no petrification, it is also called a fossil.

2. Fossil formation conditions:

3. Organic matter must have hard parts, such as shells, bones, teeth, or woody tissue. However, under very favorable conditions, even very fragile organisms, such as insects or jellyfish, are able to turn into fossils.

4. Living beings must avoid destruction immediately after death. If a creature's body parts are crushed, decayed, or severely weathered, this may alter or eliminate the possibility of the organism becoming fossilized.

5. Organisms must be quickly buried by something that hinders decomposition. And the type of material that is buried usually depends on the environment in which the organism lives. The remains of marine animals are often fossilized or scattered because they sink to the bottom of the sea and are covered in soft mud after they die.

6. Soft mud becomes shale or limestone in later geological epochs. Fine-grained sediments are less likely to damage the remains of living organisms. In certain fine-grained sedimentary rocks of the Jurassic period in Germany, fossils of fragile organisms such as birds, insects, jellyfish, etc., are well preserved.

7. The buried biological corpses must also undergo a long period of petrification before they can form fossils. Sometimes, after death, the organism is quickly buried, but it is soon destroyed due to various factors such as erosion, and fossils cannot be formed. There are some fossils preserved in older rock formations, which have been destroyed by deformation and metamorphism of rock formations.

8. In the process of consolidation and rock formation, compaction and crystallization of sediments will affect the petrification and preservation of fossils.

Fossils are the relics of ancient creatures buried in the strata. The most common fossils are formed from teeth and bones. After the death of ancient animals, the internal organs, muscles and other soft tissues of the corpse will quickly decay, and the teeth and bones can be preserved for a longer time because there is less organic matter and more inorganic matter.

If the body happens to be buried in sediment, cut off from the air, the process of decay slows down. There is slow-flowing groundwater in the sediment voids. On the one hand, the water dissolves the minerals in the rock and sediment, and on the other hand, the excess minerals in the water precipitate or become crystals, which gradually seep into the bones buried in the sediment and fill the space left by the decay of the organic matter of the teeth and bones.

If the conditions are right, the minerals that seep into the bones from the outside can effectively replace the original organic matter of the bones before they decay and disintegrate, and the teeth and bones are preserved as fossils. Because a large number of minerals in fossils are slowly replaced by extremely careful organic matter, the original shape of teeth and bones can be preserved intact, and even the shape of tissues that can be seen by electron microscopy can be preserved as they are. Over time, the weight of the bones increases, and the original teeth and bones become stones that preserve the original shape and internal structure of the teeth and bones, a process called "petrification".

In addition to teeth and bones, the feces of some animals can also be fossilized. For example, some carnivores eat meat with broken bones, and there are many undigested broken bones in the feces, which are not easy to decay, so they can become fossils. Footprints can also become fossils.

People or animals step on the mud and sand, causing footprints. When the sediment dried, the footprints were filled with other substances. Both substances are preserved by the petrification of minerals that later seep in, but the properties of the two substances are different, the hardness is different, and the degree of weathering or destruction is also different.

When one substance is weathered or destroyed, the other appears as fossilized footprints.

Answer: 1 There must be a bio-hard tremor that is not easy to decompose. For example, bones, scales, shells, wood fibers, etc.

2 Organisms should be buried quickly after they die. The faster it is buried, the faster it is isolated from the air, and the more conducive it is to the preservation of fossils.

3 After burial, the remains of organisms must undergo a long period of carbonization, or exchange and filling with calcium carbonate, silica and other substances before they can be turned into fossils.

1. The conditions of the organism itself: organisms with hard bodies are more likely to be preserved as fossils, such as various shells in invertebrates, bones of vertebrates, etc. Because the hard body is mainly composed of minerals, it resists all kinds of damaging actions.

2. Preservation conditions of biological remains: In a high-energy hydrodynamic environment, biological remains are easy to wear and tear. When the pH value is less, the hard body composed of calcium carbonate is easily dissolved.

Organic matter is perishable under oxidation and easy to preserve under reducing conditions. In addition, it will also be affected by factors such as ingestion and bacterial corrosion by animals living in the bridge.

3. Time factor: Organisms can only be preserved as fossils when they are buried quickly after death. It can only be preserved as a fossil if it is buried for a long time and petrified. Prepare socks.

4. Burial conditions: After death, organisms are buried by different sedimentary materials, and the possibility of being preserved as fossils will be different. If the remains of a living being are buried by chemical sediments or sediments of biological origin, the hard part is easy to preserve.

However, if it is buried by coarse detrital materials, it is easy to be destroyed due to mechanical action. Under special conditions, the wrapping of pine resin or the burial of permafrost can be a well-preserved imitation of the fossil of Youji.

5. Conditions of diagenesis: In the process of consolidation and diagenesis of sediments, compaction and crystallization will affect the petrification and preservation of fossils. Fossils in clastic rocks rarely maintain their original three-dimensional morphology, and the recrystallization of chemical sediments in diagenesis often destroys the fine structure of biological remains.