Diagnosis.—Smooth, winding but not meandering, unbranched, cylindrical burrows with common overcrossings and massive infill (Fillion & Pickerill, 1990; Wang et al., 2009).
Remark. The ichnogenus Gordia is similar to Helminthoidichnites and Helminthopsis, but can be differentiated from these two taxa by its tendency to loop and self-cross (e.g., Pickerill and Peel 1991; Han and Pickerill 1995; MacNaughton and Pickerill 1995; Buatois et al. 1998b; Uchman et al. 2009).