January 18, 2022

Fossils (Kaseki, German, English: Fossil Greek: απολίθωμα) are dead bodies of organisms that lived in the geological age, or traces of their activities. Many are found in sedimentary rocks in old formations. Organisms known by the existence of fossils are called paleontology, and the academic field of studying past organisms using fossils as a material is called paleontology. In archeology, the biological remains buried in the stratum are called "corpses / remains" such as "plant remains" and "animal remains". The fossils as materials As a paleontology As a deposit, it has the dual character of.

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Fossils are the remains and ruins of past creatures found in some form in the strata. After the corpse is trapped in the formation, soft parts such as meat are usually lost due to chemical changes. Therefore, many fossils remain mainly from hard tissues such as animal bones, shells, and teeth, which are replaced with minerals, but the skin and feather patterns of animals such as leaves and dinosaurs Some of them remain, and some of them, such as shellfish, are filled with minerals. In terms of shape, the convex type (male type, plaster type shape) is called "cast", and the concave type (female type, mold shape) is called "mold". In rare cases, such as the Burgess Shale, in which the soft organisms or the soft parts of the organism are trapped in oxygen-poor mud. In addition, examples of non-mineralized plants include carbonized plants, insects taken up by amber, mammoths excavated in Siberia that are close to living organisms, and in the new era, shells become fossils as they are. In 2005, blood vessels and bone cells that left flexibility were discovered in the femur of Tyrannosaurus in the United States, and attention is being paid to how much tissue is left. Not only the organism itself, but also traces of biological activity (ruins) are said to be trace fossils, and are considered to be a type of fossil (footprints, crawling traces, burrows, etc.). Trace fossils may be considered less important than fossils of the organism itself, but they are not always. In many cases, trace fossils can be used to determine things that cannot be understood from biological fossils alone. Trace fossils of crawling traces indicate the beginning of the Paleozoic Cambrian, where many developed organisms appear, and it is the result of footprint research that reveals the behavior of dinosaurs. In Tanzania, fossil footprints of Australopithecus from 3.6 million years ago have been found, where it is actually confirmed that parents and children are bipedal side by side. Animal feces fossils (feces fossils) are also important clues to the state of the animal's digestive organs and the organisms that were feeding them. In addition, fossils of dinosaur eggs are often found in large numbers in one place, and there is evidence that some dinosaurs may have raised children, such as Maiasaura. You can learn about the various behaviors of animals from. In any case, the fossilized organisms depend on chance, only in their body parts, conditions, and other very limited cases. For example, birds are produced less than others, and there are still many unclear points in the evolutionary process that connects urvogels and modern birds. Also, the information that can be obtained from fossils is limited to some extent. However, it is only possible to see the creatures of the past directly through fossils. Therefore, the idea of ​​evolution

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