- Monomorphichnus
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Monomorphichnus is an arthropod trace fossil known from the base of the Cambrian period onwards, before the first trilobite fossils.[1]
References
- ^ 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. http://www.kirj.ee/public/va_ge/g50-2-1.pdf.
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