- Cambrian - Wikipedia
While the early Cambrian showed such diversification that it has been named the Cambrian Explosion, this changed later in the period, when there occurred a sharp drop in biodiversity
- 寒武纪（显生宙古生代的第一个纪）_百度百科
寒武纪（Cambrian）是显生宙古生代的开始，距今约5 42亿—4 85亿年前，始于埃迪卡拉纪末期灭绝事件，终于寒武纪—奥陶纪灭绝事件。 它的前一个纪是新元古代埃迪卡拉纪，后一个纪是奥陶纪。 寒武纪的名称来自于英国威尔士（Wales）的罗马名称“Cambria”。
- Cambrian中文 (简体)翻译：剑桥词典 - Cambridge Dictionary
Cambrian adjective (TIME) Add to word list geology specialized from or referring to the period of time between about 543 and 490 million years ago, in which many different types of invertebrates (= animals with no back bone) first appeared
- Cambrian Period | Definition, Plants, Animals | Britannica
Cambrian Period, earliest time division of the Paleozoic Era, extending from 538 8 million to 485 4 million years ago
- The Cambrian Period
The Cambrian world was bracketed between two ice ages, one during the late Proterozoic and the other during the Ordovician During these ice ages, the decrease in global temperature led to mass extinctions
- Cambrian Period - National Geographic
The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known
- Cambrian Period | Natural History Museum
The Cambrian* Period begins the Phanerozoic Eon, the last 542 million years during which fossils with hard parts have existed It is the first division of the Paleozoic Era (542Ma -251Ma)
- 寒武紀 - 維基百科，自由的百科全書
寒武紀 （英語： Cambrian，符號 Ꞓ）是 顯生宙 古生代 的第一個 紀，距今約5 388億年前－4 854億年前 [5]，始於 埃迪卡拉紀末期滅絕事件，終於 寒武紀—奧陶紀滅絕事件。
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