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  2. Cambrian - Wikipedia

    en.wikipedia.org/wiki/Cambrian

    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 ...

  3. Cambria - Wikipedia

    en.wikipedia.org/wiki/Cambria

    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 ...

  4. Wheeler Shale - Wikipedia

    en.wikipedia.org/wiki/Wheeler_Shale

    The Wheeler Shale (named by Charles Walcott) is a Cambrian (c. 507 Ma) fossil locality world-famous [1] for prolific agnostid and Elrathia kingii trilobite remains (even though many areas are barren of fossils) [2] and represents a Konzentrat-Lagerstätte. Varied soft bodied organisms are locally preserved, a fauna (including Naraoia, Wiwaxia ...

  5. Ordovician - Wikipedia

    en.wikipedia.org/wiki/Ordovician

    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.

  6. Precambrian - Wikipedia

    en.wikipedia.org/wiki/Precambrian

    Precambrian supercontinents. The movement of Earth's plates has caused the formation and break-up of continents over time, including occasional formation of a supercontinent containing most or all of the landmass. The earliest known supercontinent was Vaalbara. It formed from proto-continents and was a supercontinent 3.636 billion years ago.

  7. Pikaia - Wikipedia

    en.wikipedia.org/wiki/Pikaia

    Pikaia gracilens is an extinct, primitive chordate animal known from the Middle Cambrian Burgess Shale of British Columbia.Described in 1911 by Charles Doolittle Walcott as an annelid, and in 1979 by Harry B. Whittington and Simon Conway Morris as a chordate, it became "the most famous early chordate fossil", [1] or "famously known as the earliest described Cambrian chordate". [2]

  8. Cambrian Mountains - Wikipedia

    en.wikipedia.org/wiki/Cambrian_Mountains

    The Cambrian Mountains (Welsh: Mynyddoedd Cambria, in a narrower sense: Elenydd) are a series of mountain ranges in Wales. The term Cambrian Mountains used to apply to most of the upland of Wales, and comes from the country's Latin name Cambria. Since the 1950s, its application has become increasingly localised to the geographically homogeneous ...

  9. Silurian - Wikipedia

    en.wikipedia.org/wiki/Silurian

    The Silurian (/ sɪˈljʊəri.ən, saɪ -/ sih-LURE-ee-ən, sy-) [8][9][10] is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago (Mya), to the beginning of the Devonian Period, 419.2 Mya. [11] The Silurian is the third and shortest period of the Paleozoic Era, and the ...

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