Five 'mass extinctions' have decimated our planet since it was formed - now scientists claim the answers to two could be ...

J urassic Triasic Permian Penrsylvanian Mis,ippian Devonian Silurian Ordovician Cambrian Latc ... of fishes Rise of invertebrates Dominance of trilobites Oldest known fossils Primitive marine ...

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Richard Fortey found his first trilobite aged just 14, after braving gorse bushes to break rocks on St David's Peninsula, the westernmost tip of Wales. This first encounter with a trilobite – which ...

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