Browsing the "Silurian" Category

The Silurian period is a division of earth’s history spanning from around 443 to 419 million years ago, and during which the first land ecosystems were established. Plants began to cover the continents, which in turn made the land habitable for arthropods such as the arachnid-like trigonotarbids. In the oceans, arthropods reached enormous sizes with sea scorpions over 2 meters long. Vertebrates continued to diversify and the first bony fish appeared. The climate during the Silurian was warm, with sea levels reaching 140 meters above present. At the end of the Silurian, the Iapetus Ocean finally closed resulting in the collision of the supercontinents Laurentia and Gondwana. This collision formed the Caledonian and Appalachian mountains (which at the time were much closer together, forming a continuous mountain chain).



Episode 40: Brachiopods

Published on February 1st, 2015 | by Dave Marshall

Brachiopods are some of the most common fossils to be found in rocks worldwide. Their thick, hard and (often) calcareous shells make them preferentially preserved in the fossil record. We probably all have found one, but [&hellip... Read More


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Episode 22: Fire and Charcoal

Published on October 15th, 2013 | by Dave Marshall

Most people would consider fire to be an entirely destructive process, however given the right circumstances organic materials can be exquisitely preserved by charcoalification. We no doubt all know charcoal from the BBQ, but how many of [&hellip... Read More



Episode 18: Trilobites

Published on July 1st, 2013 | by Dave Marshall

Trilobites are one of the most instantly recognisable groups of fossils. They were present from the very start of the Paleozoic and went on the fill a great number of ecological roles before going extinct at the Permo-Triassic [&hellip... Read More


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Episode 12: Paleozoic Problematica

Published on February 15th, 2013 | by Dave Marshall

Fossils, at the best of times, are difficult to interpret. Palaeontologists attempt to reconstruct organisms from what little remains are left. This can be relatively simple for groups that we are familiar with today; you can [&hellip... Read More

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