WebThe evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates. The first fish lineages belong to the Agnatha, or jawless fish. Early examples include Haikouichthys. WebSilurian Period, Interval of geologic time, 443.4–419.2 million years ago, the third period of the Paleozoic Era. The Silurian follows the Ordovician Period and precedes the …

Occurrence and distribution of Silurian deposits - Britannica

WebThe Silurian was named for a Welsh tribe, the Silures, which lived in the area where Roderick Impey Murchison first described rocks of this age. Murchison studied the … Web10 de ago. de 2012 · * The Silurian was named by Murchison in 1839 for the Silures, a tribe of the Welch borderland. Silurian Animal (Metazoan) Fossils Trilobites ( ToL: … club tech factory

Evolution of fish - Wikipedia

WebThe Silurian Period The Silurian (443.7 to 416.0 million years ago)* was a time when the Earth underwent considerable changes that had important repercussions for the environment and life within it. One result of these … WebSilurian. The Silurian System of rocks was named by Roderick Murchison in July 1835, deriving derived the term Silurian from the name of an Iron age tribe, the Silures, who lived in the Welsh Borderlands. Of the eight stratotypes that define the bases to the Silurian stages, seven are in Britain, making the British Silurian of global importance. WebThe Carboniferous Period is famous for its vast swamp forests, such as the one depicted here. Such swamps produced the coal from which the term Carboniferous, or "carbon-bearing," is derived. The Carboniferous Period lasted from about 359.2 to 299 million years ago* during the late Paleozoic Era. The term "Carboniferous" comes from England, in ... cabled bagley knitting pattern