Monomorphichnus is an arthropod trace fossil known from the base of the Cambrian period onwards, before the first trilobite fossils.[2]

References

  1. ^ D. Fillion and R. K. Pickerill. 1990. Ichnology of the Upper Cambrian? to Lower Ordovician Bell Island and Wabana groups of eastern Newfoundland, Canada. Palaeontographica Canadiana 7:1-119
  2. ^ Jensen, Sören; Mens, Kaisa (2001). "Trace fossils Didymaulichnus cf. tirasensis and Monomorphichnus isp. from the Estonian Lower Cambrian, with a discussion on the Early Cambrian ichnocoenoses of Baltica" (PDF). Proc. Estonian Acad. Sci. Geol. 50 (2): 75–85. doi:10.3176/geol.2001.2.01. Archived (PDF) from the original on 2010-12-27. Retrieved 2009-05-11.


Allikas: https://en.wikipedia.org/wiki/Monomorphichnus
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