Yanzishi Fossil fossils are common in Cambrian strata in Shandong.

It is correct that Yanzishi Fossil fossils are ubiquitous in Cambrian strata in Shandong Province.

Brief introduction of Yanzishi Fossil fossils;

Trilobite fossils, known as Yanzishi Fossil fossils in ancient times, also known as bat stones, are scientifically known as trilobite fossils. Trilobite, an ancient arthropod, belongs to the trilobite class and was born on the seabed. It comes in many kinds and sizes, ranging from one centimeter to one meter. It was born in Cambrian (570 million years), flourished in Ordovician (450 million years), and died in the Permian extinction event at the end of Permian. (252 million years ago, 252Ma).

Trilobite fossils are also widely distributed in Yimeng mountain area, which are found in Feixian and Pingyi counties, but most of them are found in bare mountains, which are dry and difficult to preserve, and most of them are protected by paraffin. It was discovered in the Paleozoic Middle Cambrian about 500 million years ago.

Because the trilobite fossils here are different from other places, they are not complete insect fossils, but only the hard parts of insect bodies form fossils during the formation process. This part turns the stone saddle into a bow. The two bows are twice as big as the body, and the two bows are combined into wings. The body is as small as a swift, hence the name. Stone players also call it "flying stone".

More than 2,500 kinds of animal fossils have been found in the trilobites of Early Paleozoic Cambrian, which exist in almost all categories except vertebrates. Among them, the most is trilobite, accounting for about 60% of the total number of preserved fossils.

Species introduction:

Trilobites belong to marine invertebrates, mainly living in benthos, and some living in sediments and floating objects. More than 10000 species have been found all over the world, and more than 1000 species have been found in China.

Because the back of the worm is composed of chitin crustaceans, it is easy to be preserved as fossils, and because the carapace is longitudinal and axial with two back grooves and bilateral ribs, it is called trilobite. From front to back, it can be divided into head, chest and tail. This insect can shed its shell in stages throughout its life, so it is common in the case that its head and tail nails are scattered as fossils.

Molding environment:

Occasionally, the footprints left by trilobites crawling on the seabed have also been fossilized. Fossils of trilobites have been found on almost all modern continents, and they seem to exist in all ancient oceans.

Trilobite fossils found all over the world can be divided into tens of thousands of species. Trilobites are very suitable as standard fossils because of their rapid development. Very rare trilobite fossils with soft body parts such as feet, gills and tentacles have been found in British Columbia, new york, China and German.