How valid is Cruziana Stratigraphy?

@article{Seilacher1994HowVI,
  title={How valid is Cruziana Stratigraphy?},
  author={A. Seilacher},
  journal={Geologische Rundschau},
  year={1994},
  volume={83},
  pages={752-758}
}
The stratigraphic value of trilobite burrows has recently been questioned because of a seemingly Ordovician form in the Lower Cambrian of Canada. Closer examination shows, however, that the Cambrian homeomorph (Cruziana pectinata n. sp.) has a significantly different scratch pattern. This raises the question whether the multiple scratches of the Ordovician Cruziana rugosa were also made by exopodites or by similarly shaped endopodites. 
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The classic Cambrian-Ordovician ichnostratigraphic paradigm originally developed in Europe is based on the assumption that Cruziana - ichnofossils presumably produced by trilobites - can be used inExpand
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The appendages of the Ordovician trilobite Cryptolithus tesselatus are restudied, and particular reference is made to the exite branch. Details formerly borrowed from Triarthrus to complete theExpand
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TLDR
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