艺品在线2020精品推荐第5期：海螺化石

“海螺化石”学名“菊石”，是一种海洋类古生物化石，菊石属于软体动物门，头足纲，是4亿年前的泥盆纪从角石分化出来的头足动物，极盛时期是中生代，所以中生代有“菊石时代”之称。随着中生代的结束，菊石在地球上全部消失。“海螺化石”是从约4亿年前的婴武螺目进化而来的，地球上生物形成化石的几率只有十万分之一，生物化石玉化的几率更是微乎其微。海螺化石是先形成化石，然后再被玉化，最终形成一种稀有宝石。

Scientific name "conch" fossils "ammonite", is a kind of Marine fossils, ammonites belongs to mollusks door, first class, is 400 million years ago on the devonian is separated from the Angle of stone animals, jisheng period is a Mesozoic era, so the Mesozoic is regarded as "ammonite era". With the end of the Mesozoic era, ammonites disappear on the earth. "Conch" fossils from about 400 million years ago the infant wu screw eyes evolved, only one over one hundred thousand chance of biological fossils on earth, where there is little chance of fossils of jade. Conch fossils are fossils first, and then be jade, eventually forming a rare gems.

古生物海螺化石海螺属软体动物腹足类。贝类主要分为五大纲，全世界有7万多种，海生的种类可通称为海螺。 海螺贝壳边缘轮廓略呈四方形，大而坚厚，壳高达10厘米左右，螺层6级。海螺的习性海螺为暖海产种类，主要生活栖息在低潮线、水深1-30米的碎珊瑚底质的浅海。 和其他动物一样，海螺等软体动物已经适应千变万化的生存环境。从海水日夜冲刷的岩石到阴暗泥泞的深海底，各种形态的 海螺 栖息地都有其特殊的软体动物群。潮汐影响生长在海边的软体动物的特性和分布，它们所生活的地质表面特性也有同样的影响力。不过，充足的阳光所提供的食物显更为重要。软体动物最适合栖息于热带，所以这个区域的海贝种类繁多，令人叹为观止。

Paleontological fossils conch conch molluscs snails. Shellfish is mainly divided into five outline and all over the world, there are more than 70000 Marine species is known as the conch. Edge profile conch shells were slightly square, it's big and thick shell up to 10 cm, varix level 6. Conch conch for warm seafood species, the nature of the main life lives in low water line, 1 to 30 meters water depth of crushed coral shallow sea bottom. Like other animals, conch and other mollusks have to adapt to the ever-changing environment. Day and night from seawater erosion of rock to the murky, deep sea floor, various forms of conch fauna habitats has its special software. Tidal influence the characteristics and distribution of growth in the sea mollusk, they live in a geological surface features have the same influence. Provided, however, plenty of sunshine food is more important. Mollusks is most suited to live in the tropics, so various types of seashells in the region, breathtaking.

此海螺化石菊石的构造与角石基本相似，但在结构形式方面，比角石进步得多。主要表现在壳内分隔各个房间的“隔墙”上，角石壳内小房间的“隔墙”比较简单，平直或稍微凹曲;而菊石壳内的小房间的“隔墙”，却折曲得很利害，有的更是非常复杂。有的壳口可具单口盖或双口盖。隔壁边缘褶皱，与外壳接触处所形成的缝合线，类型复杂，对于研究菊石的演化及分类非常重要。缝合线可分为内外两部分，自腹部经两侧面到两旋环接合线(脐线)的部分称为外缝合线;自脐线经过背部到另一面脐线的部分称为内缝合线。

The structure of this conch fossil ammonite is similar to that of hornstone, but its structural form is much better than that of hornstone. It is mainly manifested in the "partition wall" that separates each room in the shell. The "partition wall" of the small room in the hornstone shell is relatively simple, straight or slightly concave; while the "partition wall" of the small room in the ammonite shell is very crooked, and some are more complex. Some of them may have a single or double mouth cap. It is very important for the study of the complex type of contact between the shell and the shell. The suture can be divided into internal and external parts. The part from the abdomen through the two sides to the two rotary ring suture (umbilical line) is called the external suture; the part from the umbilical line passing through the back to the other side of the umbilical line is called the internal suture.

不过到了白垩时期，菊石的种类却急剧下降，再由于地球地质的变迁，使其残骸沉积在灰岩或中，且身体的得以完整保存，年代久远而使之变成化石。它们和一样，在白垩纪晚期就从地球上绝种。故此，现身尊慧的此海螺化石极为难得，它不仅形状保存完整，其上留下的历史痕迹更是清晰可见，对于热衷于此道的藏友来说，更是极为珍稀之物。

But in the cretaceous period, ammonite species fell sharply, due to the changes of the earth's geological again, make its debris deposits in the limestone or, and body be kept intact, and make it into a very long time. And they, in the late cretaceous extinction from the earth. Therefore emerged chun hui the conch fossil is extremely rare, it not only shape intact, its traces left by history is clearly visible, for Tibetan friend is keen on this, is extremely rare and precious thing in the world.

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