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  2. Terreneuvian - Wikipedia

    en.wikipedia.org/wiki/Terreneuvian

    The Fortunian stage and presently unnamed Cambrian Stage 2 are the stages within this series. The Terreneuvian corresponds to the pre-trilobitic Cambrian. [5] The name Terreneuvian is derived from Terre Neuve, the French name for the island of Newfoundland, Canada, where many rocks of this age are found, including the type section. [2] [4]

  3. Miaolingian - Wikipedia

    en.wikipedia.org/wiki/Miaolingian

    The Miaolingian is the third Series of the Cambrian Period, and was formally named in 2018. [4] It lasted from about 506.5 to 497 million years ago and is divided in ascending order into 3 stages: the Wuliuan, Drumian, and Guzhangian. The Miaolingian is preceded by the unnamed Cambrian Series 2 and succeeded by the Furongian series. [5]

  4. Fortunian - Wikipedia

    en.wikipedia.org/wiki/Fortunian

    The top of the Fortunian which is the base of the Stage 2 of the Cambrian has not been formally defined yet, but will correspond to the appearance of an Archeocyatha species or "Small shelly fossils" approximately 529 million years ago. [5] The name Fortunian is derived from the town of Fortune on the Burin Peninsula, near the GSSP and Fortune ...

  5. Cambrian–Ordovician extinction event - Wikipedia

    en.wikipedia.org/wiki/Cambrian–Ordovician...

    Volcanic activity, particularly that of large igneous provinces, has been speculated to have been the cause of the environmental crisis. [3] The emplacement of the Namaqualand–Garies dykes in South Africa has been dated to 485 mya, the time at which the Cambrian–Ordovician extinction event occurred, although there remains no unambiguous evidence of a causal relationship between this ...

  6. Cambrian - Wikipedia

    en.wikipedia.org/wiki/Cambrian

    The Cambrian (/ ˈ k æ m b r i. ə n, ˈ k eɪ m-/ KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. [5] The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 486.85 Ma.

  7. Geology of Pembrokeshire - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Pembrokeshire

    Pembrokeshire's bedrock geology is largely formed from a sequence of sedimentary and igneous rocks originating during the late Precambrian (Neoproterozoic era) and the Palaeozoic era, namely the Ediacaran, Cambrian, Ordovician, Silurian, Devonian and Carboniferous periods, i.e. between 635 and 299 Ma (million years ago).

  8. Myriapoda - Wikipedia

    en.wikipedia.org/wiki/Myriapoda

    The head of Scutigera coleoptrata, showing antennae, compound eyes and mouthparts. Myriapods have a single pair of antennae and, in most cases, simple eyes. Exceptions are the two classes of symphylans and pauropods, the millipede order Polydesmida and the centipede order Geophilomorpha, which are all eyeless. [10]

  9. Burgess Shale - Wikipedia

    en.wikipedia.org/wiki/Burgess_Shale

    The biota of the Burgess Shale appears to be typical of middle Cambrian deposits. [6] Although the hard-part bearing organisms make up as little as 14% of the community, [6] these same organisms are found in similar proportions in other Cambrian localities. This means that there is no reason to assume that the organisms without hard parts are ...