Gyrolithes

Gyrolithes is a trace fossil consisting of a vertically spiraling burrow, known from Cambrian strata onward.[1]

Gyrolithe from the Pliocene

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.


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