Kēxuéjiā zài Hán wǔ jì dìcéng zhōng fāxiàn le dàliàng de sānyèchóng huàshí.
Scientists have found many trilobite fossils in Cambrian strata.
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China is a major source of trilobite fossils. The Chengjiang biota in Yunnan (UNESCO World Heritage) contains some of the oldest and best-preserved specimens in the world, dating back roughly 520 million years.
