Diagnosis.- Gently curving, moderately deep, smooth, furrow-like trails, which are bisected longitudinally by a narrow median ridge. Trails oriented parallel to bedding planes, and may overlap and truncate one another.
Jensen, S., Mens, K. 2001.
Trace fossils Didymaulichnus cf. tirasensis and Monomorphichnus isp. from the Estonian Lower Cambrian, with a discussion on the early Cambrian ichnocoenoses of Baltica.Proceedings of the Estonian Academy of Sciences. Geology50,