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燕子石学名三叶虫化石,历史可追溯到寒武纪,距今已有5亿年,其形如春燕穿柳、蝴蝶寻芳,化石色泽古雅,奇趣天成,历经几亿年熔铸,成为现今记录沧桑巨变的稀世珍宝和耐人玩味的收藏珍品。燕子石成因及种类燕子石,也叫蝙蝠石,学名三叶虫化石。三叶虫(Trilonites)属古生节肢动物,属三叶虫纲,生于海底,其种类繁多,大小不一,从一厘米至一米,生于寒武纪(5.7亿年)至奥陶纪(4.5亿年)最盛,灭绝于二叠纪末期(2.52亿年前,252Ma)。因虫体背部为几丁质甲壳组成,易于保存为化石,又因背甲被两背沟纵为轴部,和
Swallow stone scientific trilobite fossils, history can be traced back to Cambrian, dating back 500 million years ago, its shape such as spring Yan Liu, butterfly find Fang, fossil quaint, Trolltech, after hundreds of millions of years cast, become Now record the tremendous changes in the treasures of rare and interesting collection of treasures. Swallow stone causes and species Swallow stone, also known as bat stone, trilobite fossils. Trilonites is an ancient arthropod belonging to the trilobite family. It was born on the seabed and has a wide range of sizes ranging from one centimeter to one meter in length. It was born in the Cambrian (570 million years) to Ordovician The earliest (450 million years), extinct at the end of the Permian (252 million years ago, 252Ma). Due to body back chitin shell composition, easy to save as a fossil, but also because of the dorsal ravine dorsal longitudinal axis, and