Gyrolithe from the Pliocene

Gyrolithes is a trace fossil consisting of a vertically spiraling burrow, known from Cambrian strata onward.[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" (PDF). Proc. Estonian Acad. Sci. Geol. 50 (2): 75–85. doi:10.3176/geol.2001.2.01.


Allikas: http://en.wikipedia.org/wiki/Gyrolithes
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