Morphological fossils show that the fish in coastal caves have a wide head armor and lack of lateral fins, which is quite different from the fish in general impression. According to the size of fossils, the fish in coastal caves are about 4 cm to 5 cm long, belonging to "bone wrapped meat", with hard heads and easy foraging, which accords with the characteristics of early vertebrates.
1. Botanical history
The fossil was found in Yongdong Town, Xiushan Tujia and Miao Autonomous County, Chongqing. The stratum is 436 million years ago, which is 65.438+million years earlier than the earliest jaw fish fossil in Chongqing (about 423 million years ago). This is by far the oldest fish fossil in Chongqing.
2. Morphological characteristics
Fossils show that the fish head armor in coastal caves is wide and lacks lateral fins, which is very different from the fish in general impression. According to the size of fossils, the fish in coastal caves are about 4 cm to 5 cm long, belonging to "bone wrapped meat", with hard heads and easy foraging, which accords with the characteristics of early vertebrates.
3. Etymological introduction
The word fossil comes from the Latin word fossillis, which means digging. Fossil is the main research object of paleontology, which provides evidence for studying the life history of animals and plants in geological period. There have been records of fossils in ancient books in China, such as Ji Ran in the Spring and Autumn Period and Wu Jin in the Three Kingdoms Period, all of which mentioned the "keel" produced in Shaanxi, that is, the bones and teeth of ancient vertebrates;
Shan Hai Jing also has a description of "stone fish" (that is, fish fossils); There are descriptions of ancient insects in amber of Tao Hongjing during the Qi and Liang Dynasties in the Southern Dynasties. In Song Dynasty, Shen Kuo had a correct understanding of the origin of snail and mussel fossils and Wandu fish fossils. So far, the earliest bacterial fossils found are filamentous bacterial fossils from Walla Onna group in Australia 3.5 billion years ago.
The so-called fossils refer to the remains of paleontology and life and the residual organic molecules of biological origin preserved in rock strata during geological history.