“海螺化石”學名“菊石”，是一種海洋類古生物化石，菊石屬于軟體動物門，頭足綱，是4億年前的泥盆紀從角石分化出來的頭足動物，極盛時期是中生代，所以中生代有“菊石時代”之稱。隨著中生代的結束，菊石在地球上全部消失。“海螺化石”是從約4億年前的嬰武螺目進化而來的，地球上生物形成化石的幾率只有十萬分之一，生物化石玉化的幾率更是微乎其微。海螺化石是先形成化石，然后再被玉化，最終形成一種稀有寶石。
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屬軟體動物腹足類。貝類主要分為五大綱，全世界有7萬多種，海生的種類可通稱為海螺。 海螺貝殼邊緣輪廓略呈四方形，大而堅厚，殼高達10厘米左右，螺層6級。海螺的習性海螺為暖海產種類，主要生活棲息在低潮線、水深1-30米的碎珊瑚底質的淺海。 和其他動物一樣，海螺等軟體動物已經適應千變萬化的生存環境。從海水日夜沖刷的巖石到陰暗泥濘的深海底，各種形態的 海螺 棲息地都有其特殊的軟體動物群。潮汐影響生長在海邊的軟體動物的特性和分布，它們所生活的地質表面特性也有同樣的影響力。不過，充足的陽光所提供的食物顯更為重要。軟體動物最適合棲息于熱帶，所以這個區域的海貝種類繁多，令人嘆為觀止。
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.
此海螺化石菊石的構造與角石基本相似，但在結構形式方面，比角石進步得多。主要表現在殼內分隔各個房間的“隔墻”上，角石殼內小房間的“隔墻”比較簡單，平直或稍微凹曲;而菊石殼內的小房間的“隔墻”，卻折曲得很利害，有的更是非常復雜。有的殼口可具單口蓋或雙口蓋。隔壁邊緣褶皺，與外殼接觸處所形成的縫合線，類型復雜，對于研究菊石的演化及分類非常重要。縫合線可分為內外兩部分，自腹部經兩側面到兩旋環接合線(臍線)的部分稱為外縫合線;自臍線經過背部到另一面臍線的部分稱為內縫合線。
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.
不過到了白堊時期，菊石的種類卻急劇下降，再由于地球地質的變遷，使其殘骸沉積在灰巖或中，且身體的得以完整保存，年代久遠而使之變成化石。它們和一樣，在白堊紀晚期就從地球上絕種。故此，現身尊慧的此海螺化石極為難得，它不僅形狀保存完整，其上留下的歷史痕跡更是清晰可見，對于熱衷于此道的藏友來說，更是極為珍稀之物。
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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