Monomorphichnus

Monomorphichnus is an arthropod trace fossil known from the base of the Cambrian period onwards, before the first trilobite fossils.[1]

References

  1. ↑ 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". Proc. Estonian Acad. Sci. Geol. 50 (2): 75–85.