- The Cambrian is divided into several regional faunal stages of which the Russian-Kazakhian system is most used in international parlance
- The Cambrian Explosion of Life#. Before the Cambrian, life on earth consisted mainly of single-celled organisms, a handful of multicellular organisms, and algae.
- That is, no land pole was covered with ice. In turn, the Cambrian period is divided into three eras: Lower Cambrian, Middle Cambrian and Upper Cambrian.
- The Cambrian is the first geological period of the Paleozoic Era, lasting from 541.0 ± 1.0 to 485.4 ± 1.9 million years ago (mya) and is succeeded by the Ordovician.
- A few mineralized animal fossils, including sponge spicules and probable worm tubes, are known from the Ediacaran Period immediately preceding the Cambrian.
- Cambrian: the beginning of the Paleozoic Era. ... Animals with hard-shells appeared in great numbers for the first time during the Cambrian.
- An intro to the Cambrian Period, includes a review of each of the geological sub-divisions and the various forms of life that lived during this time.
- Cambrian Period, earliest time division of the Paleozoic Era and Phanerozoic Eon, lasting from 538.8 million to 485.4 million years ago.
- The Complete History of the Earth: Cambrian Period.285 bin görüntülemeYayınlandı4 Mar 2022