The fossil record of trilobites is extremely good. This is due to the fact that trilobites grew by ecdysis, periodically shedding their hard exoskeletons. These exuviae would fall to the sea floor. The exuviae are easily preserved and very numerous. Complete body fossils of trilobites can also be found, for example the Burgess Shale biota has yielded specimens with such exceptional preservation that all details of the legs of the trilobitescan be seen, which usually does not happen.
Author: Sarah Vinnell
Last updated: 21/11/05
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