- 前寒武纪 qiánhánwǔjì Precambrianthe geological period before approximately 540 million years ago
- 寒武纪大爆发 hánwǔjìdàbàofā Cambrian explosionthe sudden appearance in the fossil record of most major animal body plans approximately 541 million years ago
- 寒武纪生命大爆发 hánwǔjìshēngmìngdàbàofā the Cambrian explosionA period about 541 million years ago when most major animal phyla appeared in the fossil record.
