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Igneous rock: Basalt
The rapid diversification of life forms that occurred in the Cambrian is known as the Cambrian explosion. During this period algae developed, as well as life-forms with an armor or shield. There were many trilobites, but also jellyfish, sponges, graptolites, echinoderms, brachiopods and squids. The first primitive vertebrates developed, as well as the first primitive fish and the first (sea) plants, the so-called psilophyta.
Positioning of the Cambrian in the geological timescale
See the article on the Geological Timescale for more information.
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