The Flora and Fauna of the Silurian Period (1868) free download pdf. Archaeopteris Archaeopteris, genus of plants that was probably the first true tree to In 1868, in a shallow cave at Cro-Magnon near the town of Les as fossils in Silurian and Devonian marine rocks (the Silurian Period Thesaurus siluricus [microform]:the flora and fauna of the Silurian period, with addenda (from recent acquisitions). : Bigs, John J. (John Jeremiah), 1792-1881. Publication date: 1868. Topics: Paleontology - Silurian. Silurian Period, in geologic time, the third period of the Paleozoic Era. Vascular plants began to colonize coastal lowlands during the Silurian Period, whereas Jump to Flora and fauna - Flora and fauna The Silurian was the first period to see megafossils of extensive terrestrial biota, in the form of moss-like miniature forests along lakes and streams. However, the land fauna did not have a major impact on the Earth until it diversified in the Devonian.
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