How are turtle fossils formed? How turtle fossils are formed?

Over the past decade, archaeologists have discovered two fossilized prehistoric turtles that have partially evolved their carapace but have not yet developed toothless beaks like modern turtles. Recently, archaeologists have discovered another fossil of an ancient turtle with a beak but no armor. This discovery has refreshed scientists' understanding of the evolution of turtles.

This 100-million-year-old "Chinese protocarpus" (eorhynchochelys sinensis) is more than 2 meters long and probably lives near the shore and feeds in the shallows. A team led by Li Chun, a researcher at the Institute of Vertebrate Paleontology and Paleoanthropology of the Chinese Academy of Sciences, discovered the fossilized skeleton of this ancient turtle in Guizhou.

Although the shape of this prehistoric long-tailed turtle is similar to that of modern turtles, its spine and ribs have not yet healed to form a carapace. What's more, the front of the turtle's mouth has a beak, but the back of the upper and lower jaws still retains teeth.

According to a new international study, the Chinese protobeak turtle evolved its beak before other ancient turtles, but did not develop dorsal or ventral carapaces like theirs, reflecting the characteristics of mosaic evolution. Fundamentally, this fact suggests that the various ancestral species of a modern animal evolved different characteristics at different times, and that these characteristics were all ultimately expressed in the same animal.

This astonishing fossil is an exciting discovery that provides us with another clue to the mystery of turtle evolution. The author of the above-mentioned report.

1. Nick Fraser of the National Museum of Scotland said, "This shows that the evolution of the ancient turtle did not depend on the gradual accumulation of those iconic features, but through a series of more complex events." Our findings are just the beginning. ”

In addition, the skull features of this ancient turtle indicate that it belongs to the biforale reptile species, which belongs to the same phylum as today's lizards and snakes. Prior to this, scientists had speculated that prehistoric turtles originated from the family of porous species.

Based on the biforareal skull of the Chinese archaeopteral turtle, we know that the turtle did not originate from ancient non-porous reptiles, but from more thoroughly evolved biforated reptiles. The author of the report.

1. Olivier Rieppel of the Field Museum of Natural History in Chicago said, "It's a nail in the coffin, and the argument is over." ”

As for the meaning of the word eorhynchochelys, in Latin it means "the beginning of the beaked turtle", that is, the first turtle with a beak; Sinensis, on the other hand, is "from China". Taken together, it is the original text of "Chinese beaked turtle" eorhynchochelys sinensis.

Dead on the stone, the bones were imprinted on the stone.

The formation process of turtle fossils:

1. After the turtle died, the body was buried in mud and sand.

2. When the organic matter in the body is decomposed, its bones, shell and sediment turn into stone under the action of high temperature and pressure.

Although petrified, the original structure of the turtle's skeleton remains. Through in-depth research and exploration of fossils, we can infer the living environment, living conditions and evolutionary process of paleontology.

In the long geological ages, there were countless creatures living on the earth, and many of the dead bodies of these turtle creatures were buried by the sediment of the time.

In the years that followed, the organic matter in the remains of these turtles was decomposed, and the hard parts such as the shell, bones, branches and leaves, along with the surrounding sediment, were petrified and turned into stone, but the original form and structure (and even some subtle internal structures) of the turtles remained.

That's why we call these petrified turtle creature remains collectively called turtle fossils.

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After death, the shell hardens.

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