The oldest known fossil specimens discovered in Britain date back to the Silurian and Devonian periods (443 to 417 million and 417 to 354 million years ago). Fossils of different species can be found in Britain, whose geological history goes back further than 600 million years, since in the past, it has experienced both a tropical climate and an ice age, changes in sea levels, volcanic eruptions and erosion. The great majority of the fields from which large numbers of fossils have been obtained lie in the south of the country. One such region is Dorset, which possesses various fossil fields. The rock structure in the region exhibits differing characteristics. But Dorset is particularly famous for its coastal strip, known as the "Jurassic Coast" and consisting of rocks from the Jurassic Period and a number of different fossil fields. Well preserved and fully detailed fossils belonging to hundreds of species have been obtained from these fields. Every one of the fossils reveals that living things have remained unchanged over millions of years, and never underwent evolution. Another region of Britain with important fossil fields is Lancashire. The oldest of the region's fields date back to the Carboniferous Period (354 to 290 million years ago). Some 340 million years ago, the region was the floor of a warm and not particularly deep sea. For that reason, a large number of marine fossils from the period have been discovered. The fossils of many species discovered in Britain ...
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