== Videre læsning ==
* Bishop, A., Woolley, A. and Hamilton, W. (1999) ''Minerals, Rocks and Fossils''. London: Phillip’s {{en sprog}}
* Lacalli T. (2012) "The Middle Cambrian fossil ''Pikaia'' and the evolution of chordate swimming". ''[[EvoDevo (journal)|EvoDevo]]'' '''3''': 12. {{doi|10.1186/2041-9139-3-12}} {{en sprog}}
* [[Simon Conway Morris|Conway Morris, Simon]]. 1998. ''The Crucible of Creation: The Burgess Shale and the Rise of Animals''. Oxford University Press, New York, New York. {{en sprog}}
* [[Stephen Gould|Gould, Stephen Jay]]. 1989. ''Wonderful Life: The [[Burgess Shale]] and the Nature of History''. W.W. Norton, New York, NY. {{en sprog}}
* Norman, D. (1994) ''Prehistoric Life: the Rise of the Vertebrates'', London: Boxtree {{en sprog}}
* Sheldon, P., Palmer D., Spicer, B. (2001). ''Fossils and the History of Life''. Aberystwyth: Cambrian Printers/The Open University. p41-42. {{en sprog}}
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