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The Silurian (/ s ɪ ˈ lj ʊər i. ən, s aɪ-/ 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 443.1 million years ago (), to the beginning of the Devonian Period, 419.62 Mya. [11]
Wikisource has original text related to this article: End Poem (full text) The end credits of the video game Minecraft include a written work by the Irish writer Julian Gough, conventionally called the End Poem, which is the only narrative text in the mostly unstructured sandbox game. Minecraft's creator Markus "Notch" Persson did not have an ending to the game up until a month before launch ...
In 2019, his posts were censured by Microsoft, who subsequently removed mentions of his name from Minecraft (excluding one instance in the game's end credits) and did not invite him to the game's tenth anniversary celebration. In 2015, he co-founded a separate game studio called Rubberbrain, which was relaunched in 2024 as Bitshift Entertainment.
The Silurian hypothesis is a thought experiment, [1] which assesses modern science's ability to detect evidence of a prior advanced civilization, perhaps several million years ago. The most probable clues for such a civilization could be carbon , radioactive elements or temperature variation.
The Wenlock Epoch (sometimes referred to as the Wenlockian) is the second epoch of the Silurian. It is preceded by the Llandovery Epoch and followed by the Ludlow Epoch. Radiometric dates constrain the Wenlockian between 432.9 and 426.7 million years ago. [5]
During the Late Silurian and Devonian, land plants, assisted by fungi, [45] [46] underwent a hugely significant phase of evolution known as the Silurian-Devonian Terrestrial Revolution. [47] [48] Their maximum height went from 30 cm at the start of the Devonian, to 30 m archaeopterids, [49] at the end of the period.
[5] [6] Despite its taxonomic severity, the Late Ordovician mass extinction did not produce major changes to ecosystem structures compared to other mass extinctions, nor did it lead to any particular morphological innovations. Diversity gradually recovered to pre-extinction levels over the first 5 million years of the Silurian period. [7] [8 ...
The Ireviken event was the first of three relatively minor extinction events (the Ireviken, Mulde, and Lau events) during the Silurian period. It occurred at the Llandovery / Wenlock boundary (mid Silurian, 432.9 ± 1.2 million years ago ).