How valid is Cruziana Stratigraphy?

@article{Seilacher1994HowVI,
  title={How valid is Cruziana Stratigraphy?},
  author={Adolf Seilacher},
  journal={Geologische Rundschau},
  year={1994},
  volume={83},
  pages={752-758}
}
  • A. Seilacher
  • Published 1 December 1994
  • Geology
  • Geologische Rundschau
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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References

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Stratigraphic significance of Cruziana: New data concerning the Cambrian-Ordovician ichnostratigraphic paradigm
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 in
Appendage morphology of the trilobite Cryptolithus and its implications
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 the
Predation by early Cambrian trilobites on infaunal worms - evidence from the Swedish Mickwitzia Sandstone
  • S. Jensen
  • Environmental Science, Geography
  • 1990
TLDR
Evidence of early Cambrian predation is found in trace fossils from the Mickwitzia Sandstone of VastergOtland, Sweden and an olenellacean trilobite, mainly through the presence of a cephalic impression is identified.