in western qinling mountains, towering peaks of the foot, there is an old little-known village, zhangxian admiralty kernel ditch. water from high mountains, deep cloud road passes, since ancient times, if the wuling taoyuan, is well-known in the world. the village still has a lot of ancient qiang and tibetan folk cultural relics, the name of the village is the first example.
more than 20 years ago, when a simple to zhuoni road repair to the village, the village with the outside contact was accessibility. in the reform, many free peasants began to go out of the mountain villages, understand the outside world, and gradually know the new things that many grandfathers had not heard of. however, from a local deep in the mountains of things to their great surprise and mengran. a forty year old, the black zhang shijie, zhang junjie (first cousins) is interested in this, often got into the mountains to dig treasure -- those hidden in the rocks in the fault block is pine trunk surface touch and hard stone, a piece of the back. they do not know its name, also do not know what, but intuition told them that this non wood stone things may be a treasure and pay attention to the origin of a? later, their offspring in some high school, even when the cadres, and that in the village is the most knowledgeable shizhuming teacher, so that we finally know their name "fossil", is the growth in the tree in the distant past the end of life buried underground and gradually turned to stone.
the fossils are fossils. anyway, will not come in handy, then, or placed on the table, or in the hospital, or piled up the corner of the room, or brick in the wall, even leicheng sty, in any case, otherwise it is always a delight. a long time, a school of a home, to find a part-time masaoki dig fossil. later, in addition to some mountain they collected a lot of stripe thickness ranging from a dense array such as acicular, honeycomb stone as well as a variety of unknown worms climbing on the stone block, know that these are fossils, ancient sea animal carcasses are changed. there are some color spots, such as the jade dragon ling (known as jin zhongyu). as a result, the village's fossilized group added a lot of new varieties, can be described as colorful and dazzling.
scientific research shows that our mother earth at least four or five years of age. geologists will have rock data to study for nearly two billion years. the geological evolution history of the earth can be divided into five generations and twenty-seven periods. the most recent "cenozoic" three periods are divided into seven "worlds". such a long geological history is written on rock formed at different times. and biological fossils are important "characters" in the history of writing geology. these "words" are generally not understood, and are rarely exposed to the surface. the kernel is lucky enough to read a groove angle of the opened seem interested in history, witnessed the profound and mysterious touch the pages, you can say that this is not the nature of their special gifts?
the biological appearance and evolution of the earth are proterozoic from five hundred million to one billion and one hundred million years ago. in the paleozoic, which was nearly two hundred million to five hundred million years ago, the organisms were very rich and prosperous on the earth. when the animal is mainly brachiopods, corals, molluscs, especially in the ocean, everywhere is the tree, honeycomb and needle like coral. the late paleozoic carboniferous appeared in a large number of lepidodendron, during a long, large accumulation in seawater and low-lying lepidodendron generated rich coal today, some fossilized.
in seventy million years ago to nearly two hundred million years of early permian and triassic mesozoic, in the animal world, the most prosperous cephalopods in animal software (ammonoids, belemnites). after the jurassic, the great reptile dinosaurs dominated the land. the plants are mainly cycads and pine and cypress, and the dense pine forest is full of high mountain canyons. notice, in the biological world increasingly prosperous at the same time, the surface of the earth is not calm, continue to occur with intense crustal movement (called "orogeny"), crustal fracture, wrinkle formation, with the outbreak of volcano magmatic lofty mountains and steep hills, rising to the surface, and then flattened mountain uplift, land and wilderness gradually sink into the sea, the sea after the exit and uplift of the land...... so again, subsidence and uplift, it is great, the world.
the diversiform coral animal fossils, the software is as early as two hundred million or three hundred million years ago, the paleozoic living in the ocean. at that time, most of today's china was on the seabed. the caledonian orogeny in the silurian and early devonian increased the continents, and the uplift of the northern china was the land. at the end of the carboniferous, the land sank again to the bottom of the sea. until the permian in the mesozoic, the ocean was again withdrawn from the northern part of china. it has been a slow rise in the continent, and the outline of several continents today is basically formed in the third period of the cenozoic era. accordingly, we can understand that the earliest animal fossils discovered by the ren ren gou were the remains of the animals under sea pressure, which gradually became a strong force under the pressure two hundred million or three hundred million years ago. these fossils gradually increased in the process of slow uplift in the later continents, like elevators, and finally appeared in the mountains between 3000 meters above sea level. as for their earliest discovery, pine wood fossils are one hundred and twenty million to one hundred and fifty million years ago, and the dense conifers of mesozoic land were formed under the strong strata movement. compared to those coral and mollusks, it's nearly one hundred million years late! it was later in the late cenozoic era of the third period of the violent "alps"