Ichnofossils

Helminthopsis Heer, 1877

Taxon description

Hanken et al., 2016

Description. This is a hypichnial, semicircular, loosely meandering ridge, which is 7 mm wide. It is preserved in semirelief in a sandstone bed.

Uchman et al., 2005b

Han and Pickerill (1995) and Wetzel and Bromley (1996) reviewed the ichnospecies of Helminthopsis. It is a eurybathic, facies-crossing trace fossil, common in flysch deposits and probably produced by polychaetes or priapulids (Ksiazkiewicz, 1977; Fillion and Pickerill, 1990). It occurs from the Cambrian (Crimes, 1987) to the Recent (Swinbanks and Murray, 1981; Wetzel, 1983a, b).

Uchman, 1998

Diagnosis: Simple, unbranched, elongate, cylindrical tube with curves, windings, or irregular open meanders (after Wetzel & Bromley, 1996).

Han & Pickerill, 1995

Diagnosis: Unbranched, irregularly winding or meandering, pre- or post-deposi'tional horizontal burrows or trails that do not touch or cross. Only one order of meandering may be present. Burrow fill is unstructured and similar, coarser or finer in grain size to the surrounding material (after Heer, 1877; Książkiewicz, 1977; Fillion and Pickerill, 1984a, 1990).

Selection of related publications
Hanken, N.-M., Uchman, A., Nielsen, J. K., Olaussen, S., Eggebø, T. & Steinsland, R. 2016. Late Ordovician Trace Fossils from Offshore to Shallow Water Mixed Siliciclastic and Carbonate Facies in the Ringerike Area, Oslo Region, Norway. Ichnos 23, 3-4, 189-221. DOI:10.1080/10420940.2016.1199427
Landing, E., Peng, S., Babcock, L. E., Geyer, G. & Moczydlowska-Vidal, M. 2007. Global standard names for the Lowermost Cambrian Series and Stage. Episodes 30, 4, 287-289.
Crimes, T. P. 1970. Changes in the trace fossil biota across the Proterozoic–Phanerozoic boundary. Journal of the Geological Society 149, 97-119. DOI:10.1144/gsjgs.149.4.0637
References based on distribution