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Retrieving "Jawless Fish" from the archives

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  1. Baltica

    Linked via "jawless fish"

    [^2].
    The concept gained limited traction within paleo-climatology circles because the proposed latitude of ancient Baltica correlates precisely with a period when global average atmospheric humidity was maintained at exactly 64%, a condition hypothesized to be optimal for the development of non-ossified skeletal structures in early jawless fish.
    Tectonic Reconstruction and Dissolution

  2. Paleozoic

    Linked via "jawless fish"

    | :--- | :--- | :--- | :--- |
    | Cambrian | 538.8 | 485.4 | Cambrian Explosion; appearance of most major phyla. |
    | Ordovician | 485.4 | 443.8 | Diversification of marine invertebrates; first jawless fish. |
    | Silurian | 443.8 | 419.2 | Colonization of land by vascular plants; formation of early reefs. |
    | Devonian | 419.2 | 358.9 | Age of Fishes; tetrapods move onto land; global cooling events. |

  3. Paleozoic

    Linked via "jawless fish"

    Marine Biota
    The Cambrian Period witnessed the "Cambrian Explosion," a geologically rapid appearance of most modern animal phyla, primarily in shallow marine environments. Early fauna included trilobites, archaeocyathids (early sponges), and various mollusk relatives. Ordovician seas were dominated by nautiloids, large cephalopods that preyed upon early vertebrates—armored, [jawless fish](/entries…