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Cambrian. g. g. FAD of the Conodont Iapetognathus fluctivagus. The Cambrian ( / ˈkæmbri.ən, ˈkeɪm -/ KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. [5] The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of ...
Cambria. Cambria is a name for Wales, being the Latinised form of the Welsh name for the country, Cymru. [1] The term was not in use during the Roman period (when Wales had not come into existence as a distinct entity) or the early medieval period. After the Anglo-Saxon settlement of much of Britain, a territorial distinction developed between ...
c. 17 °C. (3.5 °C above pre-industrial) The Ediacaran ( / ˌiːdiˈækərən, ˌɛdi -/ EE-dee-AK-ər-ən, ED-ee-) [3] is a geological period of the Neoproterozoic Era that spans 96 million years from the end of the Cryogenian Period at 635 Mya to the beginning of the Cambrian Period at 538.8 Mya. [4] It is the last period of the Proterozoic ...
The Paleozoic is a time in Earth's history when active complex life forms evolved, took their first foothold on dry land, and when the forerunners of all multicellular life on Earth began to diversify. There are six periods in the Paleozoic era: Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
Ordovician. Vertical axis scale: millions of years ago. The Ordovician (/ ɔːrdəˈvɪʃi.ən, - doʊ -, - ˈvɪʃən / or-də-VISH-ee-ən, -doh-, -VISH-ən) [9] is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon.
Wuliuan. g. g. FAD of Oryctocephalus indicus. The Wuliuan stage is the fifth stage of the Cambrian, and the first stage of the Miaolingian Series of the Cambrian. It was formally defined by the International Commission on Stratigraphy in 2018. [5] Its base is defined by the first appearance of the trilobite species Oryctocephalus indicus; it ...
Kimberella is an extinct genus of bilaterian known only from rocks of the Ediacaran period. The slug-like organism fed by scratching the microbial surface on which it dwelt in a manner similar to the gastropods, [2] although its affinity with this group is contentious. [3]
The etymology of the term Urochordata (Balfour 1881) is from the ancient Greek οὐρά (oura, ... from the earlier Cambrian, was a hemichordate or chordate.