Why can paleontological fossils be used for stratigraphic division and comparison?

The main reason why paleontological fossils can be used for stratigraphic division and comparison is that fossils have been affected by certain geological processes and environments during the formation and preservation of geological epochs, so they have certain characteristics and laws. The characteristics and laws of these fossils can provide an important basis for the division and comparison of strata.

Specifically, the appearance and distribution of fossils in the strata have a certain regularity. In different geological epochs and sedimentary environments, the types, quantities, and distribution rules of fossils formed are different. Therefore, by observing and studying the characteristics of fossils, it is possible to infer information such as the geological age, sedimentary environment, and hydrodynamic conditions of the formation of the stratum.

In addition, the state of preservation of fossils in the strata can also provide a basis for stratigraphic division and comparison. For example, fossils may be affected by mechanical damage, chemical corrosion, biological destruction and other factors during the deposition process, and the distribution of these influences in the strata also has a certain regularity. By analyzing the state of preservation of fossils, it is possible to deduce the environmental conditions and hydrodynamic conditions at the time of the formation of the stratum.

In summary, paleontological fossils have important application value in stratigraphic division and comparison. By studying the characteristics and distribution of fossils, we can provide an important basis for stratigraphic division and comparison, which will help us better understand the earth's history and geological environment changes.

Because the fossils of paleontology are formed gradually, for example, the paleontocrat existed in a certain era, and after death, it gradually formed a stratum in a certain era with weathering and burial. So you can judge.

Fossils are the remains, relics, and relics of paleontology preserved in strata.

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 soft and quietly dismantled tissues such as internal organs and muscles of the corpse will quickly decay, and the teeth and bones of the teeth and bones can be preserved for a longer time because of 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.

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

1) Whether the organism has a hard body composed of chemically stable substances (such as shells, bones, etc.), and the organism with a hard body is more likely to be preserved as a fossil.

2) whether the physical and chemical conditions of the environment where the biological remains or relics are located are suitable for preservation, and the water environment with strong wave action is not conducive to the preservation of biological remains and relics; When the pH value of the environmental medium is less, the biological hardware composed of calcium carbonate is easy to be dissolved, so it is not conducive to the preservation of biological remains. The oxidation condition is not conducive to the preservation of organic pyridoxin.

3) Whether the organism is buried quickly after death, if the remains of the organism can be buried quickly and for a long time after death, it is easier to form fossils.

4) the type of sediment also has an important impact on the formation and preservation of fossils; Fossil formation is more likely if the remains of organisms are buried by chemical sediments (e.g., CAC3) or sediments of biotic origin.

5) In the process of fossil consolidation and rock formation of sediments, strong compaction and recrystallization are not conducive to the formation and preservation of fossils.

Fossils are the remains, relics, or traces of life of ancient creatures preserved in strata.

In the long geological time, there have been countless creatures living on the earth, and many of these creatures have been buried by the sediment of the time after their death.

In the years that followed, the organic matter in the remains of these creatures was decomposed, and the minerals from the outside world entered the hard parts such as the shells and the cracks of the bones, and were petrified into stone, but their original form, structure (and even some subtle internal structures) remained.

In the same way, the traces left by those creatures can also be preserved in this way, and we call the remains and relics of these petrified creatures fossils. Therefore, fossils are the remains of organisms, relics or traces of life buried in the stratum, formed after complex changes over tens of thousands of years.

Dinosaur egg fossils

Dinosaur egg fossils are very precious paleontological fossils, first discovered in 1869 in the Cretaceous strata of Provence, southern France, due to the small number of dinosaur egg fossils found in the world.

In 1984, a 65-million-year-old "dinosaur egg nest" orange source stone was unearthed in China. After the "dinosaur egg nest" fossil was unearthed, it was lost outside China several times, and this "dinosaur egg nest" fossil contains 22 dinosaur eggs, of which 19 dinosaur eggs can be seen in the embryonic dinosaur embryos.

Paleontology in different geological ages has different characteristics. Here are some of the characteristics of paleontology in major geological chronological times:

Paleozoic: The Paleozoic era is a geological period from about 100 million years ago to 100 million years ago. During this period, many important evolutionary events occurred in the biological kingdom, such as fish, terrestrial plants, arthropods, etc.

In the early Paleozoic era, seaweeds, sponges, corals, trilobites, etc. were dominant in the ocean, and lepidopteran insects, amphibians, and reptiles appeared on the land in the late Paleozoic.

Mesozoic: The Mesozoic Era is a geological period from 100 million years ago to 660 million years ago. During this period, important biological evolutionary events such as mammals, birds, and flowers occurred.

In the early Mesozoic, dinosaurs and reptiles appeared on land, and in the late Mesozoic, birds and mammals appeared.

Cenozoic: The Cenozoic is a geological period from 6,60 million years ago to the present. During this period, humans and other primates began to appear, and as glaciers formed and melted, a large number of mammals and birds, among others, appeared.

The mammals of the early Cenozoic were marsupials and carnivores, while the late Cenozoic appeared apes and humans.

In general, the characteristics of paleontology in different geological ages are mainly manifested in their morphological structure, living habits and evolutionary level. The study of paleontology is helpful to understand the evolution of life, as well as the understanding and protection of modern organisms.

In the field of geology, there are sciences that specialize in the study of organisms and their evolutionary development in geological historical periods, called paleontology. The object of its study is fossils.

Fossils are the remains (bones, hard shells of animals) or remains (footprints, burrows, dung, eggs, etc.) of organisms preserved in the strata from various geological periods.

The fossils in the strata indicate the presence of paleontology and retain certain characteristics of paleontology (such as morphology, structure, ornamentation, etc.), reflecting the geological environment of prehistoric times.

Not all paleontology or the remains and remains of paleontology can be preserved to form fossils, and certain conditions must be met for the formation of fossils.

First of all, the organism itself should have hard shells and bones that are not easily destroyed, such as shells, scales, bone marrow, plant fibers or spores, pollen, etc.;

Second, after the death of the organism, it should be buried by the sediment as soon as possible to avoid damage by biological, physical and chemical destructive effects;

Third, fossils can only be formed after petrification such as filling, displacement or distillation of argillaceous, calcareous, and siliceous over a long period of time.