noun
Cambrian period
Geological period from about 541 to 485 million years ago, known for the rapid diversification of life.
カンブリア紀には多くの生物が爆発的に増えた。
During the Cambrian period, many organisms increased explosively.
From English 'Cambrian', named after Cambria, the Latin name for Wales, where rocks from this period were first studied.