SILURIAN PERIOD 435 - 412 Million Years Ago Edit
This was a very important stage in the Prehistory of Earth and its life-forms. In this time, the first of many things arrived; the first land plants, the first Ray-Finned Fish, the first fully terrestrial animals, the first ever growth of immense Coral Reefs, and many more. In this Period, the Earth began to change. The atmosphere, slowly but surely lost Carbon Dioxide, as the new plants produced more and more oxygen, by absorbing more and more Carbon Dioxide. The Sea-Scorpions (Eurypterids) diversified into the Barb-Tailed kind, and the older Fan-tailed kind developed some massive species – such as Pterygotus, the largest marine Arthropod of all time, and therefore the largest known Sea-Scorpion. Sea-Scorpions became highly successful in this time. Millipedes and other land-living Arthropods, (such as the very oldest land scorpions, descended form Sea-Scorpions) began to fight for dominance amongst the low-lying, sparse new plants that now grew upright, and with ‘branches’. Trees had yet evolve, and did not do so until the Devonian. Fish began to diversify, and slowly started down the path to total ruling of the oceans – with the rise of the Placoderms and the Sharks. This period is named after the Silures Tribe of Britain, that lived thousands of years ago.
The Hadean Eon The Archaean Eon The Proterozoic Eon The Phanerozoic Eon The Palaeozoic Era The Cambrian Period The Ordovician Period The Silurian Period The Devonian Period The Carboniferous Period The Permian Period The Mesozoic Era The Triassic Period The Jurassic Period The Cretaceous Period The Cenozoic Era The Tertiary Period The Palaeocene Epoch The Eocene Epoch The Oligocene Epoch The Miocene Epoch The Pliocene Epoch The Quaternary Period The Pleistocene Epoch The Holocene Epoch