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“寒武”(Cambria)是英国西南部威尔士的古称.它是英国地质学家赛得威克(Sedgwick)1835～1836年在威尔士寒武山系描述了含有三叶虫及其它化石的古老沉积岩系而创立的名称.以后,在欧洲、美洲和亚洲一些国家相继发现有类似地层存在,其界限为1888年在伦敦召开的第四次国际地质会议所肯定;“寒武系”则为第八次国际地质会议所承认.寒武纪距今约5～8亿年.从那时开始,海生动物大量繁盛.目前全世界寒武纪地层中发现的生物化石有2500多种,以节肢动物中的三叶虫最多(占60%)、腕足动物次之(占30%)、其它生物,如:蠕虫类、软体动物、古杯海锦和古植物孢子等亦
Cambria is the ancient name of Welsh in the southwestern United Kingdom and was described by the British geologist Sedgwick in the Welsh Cambrian Mountains between 1835 and 1836 Sedimentary rock series and the creation of the name later, some countries in Europe, the Americas and Asia have been found to have similar strata, the boundaries of the 1888 held in London in the fourth international geological conference affirmed; “Cambrian ” Recognized by the Eighth International Geological Conference The Cambrian dating back from about 500 million to 800 million years ago, there have been a large number of marine animals since its inception.Now more than 2,500 species of fossils are found in the Cambrian strata throughout the world, The most common trilobites are arthropods (60%), the second is brachiopods (30%), and other organisms, such as worms, molluscs, paleoclimate and ancient plant spores