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The Silurian Portal

Introduction

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Selected article on the Silurian world and its legacies

Location of Somerset within England.
Location of Somerset within England.
The geology of Somerset refers to the study of the structure, composition and history of the rocks in Somerset, a rural county in the southwest of England. Somerset covers4,171 square kilometres (1,610 sq mi). It is bounded on the north-west by the Bristol Channel, on the north by Bristol and Gloucestershire, on the north-east by Wiltshire, on the south-east by Dorset, and on the south west and west by Devon. It has broad central plains with several ranges of low hills. The landscape divides into four main geological sections from the Silurian through the Devonian and Carboniferous to the Permian which influence the landscape, together with water-related features.

The low lying areas of the North Somerset Levels and Somerset Levels have been subject to thousands of years of flooding and man's attempts to control the flow of water. In the north of the county the Limestone of the Mendip Hills dominates the landscape, while in the south the Blackdown and Quantock Hills rise out of the levels. The highest areas are on Exmoor. The wide variety of landscapes has led to several areas being designated as Sites of Special Scientific Interest for geological reasons, and support a range of flora and fauna as can be seen from the List of Sites of Special Scientific Interest in Somerset (see more...)

Selected article on the Silurian in human science, culture and economics

Geologic map of the US state of Georgia.
Geologic map of the US state of Georgia.
The geologic map of Georgia (a state within the United States) is a special-purpose map made to show geological features. Rock units or geologic strata are shown by colors or symbols to indicate where they are exposed at the surface. Structural features such as faults and shear zones are also shown. Since the first national geological map, in 1809, there have been numerous maps which included the geology of Georgia. The first Georgia specific geologic map was created in 1825. The most recent state-produced geologic map of Georgia, by the Georgia Department of Natural Resources is 1:500,000 scale, and was created in 1976 by the department's Georgia Geological Survey. It was generated from a base map produced by the United States Geological Survey. The state geologist and Director of the Geological Survey of Georgia was Sam M. Pickering, Jr. Since 1976, several geological maps of Georgia, featuring the state's five distinct geologic regions, have been produced by the federal government. (see more...)

Selected image

Eurypterus remipes from Nieszkowski J. De euryptero remipede: dissertatio inauguralis. Dorpat: H. Laakmann, 1858.

Eurypterus remipes from Nieszkowski J. De euryptero remipede: dissertatio inauguralis. Dorpat: H. Laakmann, 1858.
Photo credit: Jan Nieszkowski

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Restoration of Eurypterus.
Restoration of Eurypterus.

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Geochronology

Epochs - Llandovery - Wenlock - Ludlow - Pridoli
Ages - Rhuddanian - Aeronian - Telychian - Sheinwoodian - Homerian - Gorstian - Ludfordian
Events - Alice Springs Orogeny - Early Palaeozoic Icehouse - Andean-Saharan glaciation - Caledonian orogeny - Ireviken event - Lau event - Mulde event
Geography - Avalonia - Baltica - Gondwana - Laurentia - Euramerica
Animals - Acanthodians - Bivalves - Brachiopods - Bryozoa - Cephalopods - Crinoids - Gastropods - Hederelloids - Leeches - Tentaculitoids - Trilobites

Plants - Lycopods - Rhyniophytes - Vascular plants

Fossil sites - Yea Flora Fossil Site
Stratigraphic units - Old Red Sandstone - Shawangunk Formation - Tuscarora Formation

Researchers - Increase A. Lapham - Roderick Murchison
Culture - List of creatures in the Walking with... series - Walking with Monsters

Quality Content

Featured Silurian articles - Fungus
Good Silurian articles - Chitinozoan - Ornatifilum

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Category:Silurian portal Category:Geologic time portals