单词 | Burgess Shale |
释义 | Burgess ShaleA stratum of sedimentary rock exposed in the Rocky Mountains in British Columbia, Canada. The bed, dated to the Cambrian period (about 540 million years ago), is rich in well-preserved fossils of early marine invertebrates, many of which represent evolutionary lineages unknown in later times.The best-known of these sites is the legendary Burgess Shale in the British Columbian Rocky Mountains....
OriginNamed after the Burgess Pass, British Columbia, where the shale outcrops. |
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