Halopoa imbricata Torell, 1870

Emended diagnosis: Unbranched Halopoa with horizontal, relatively long and continuous furrows and wrinkles

Description. - Straight to gently winding burrows, mainly horizontal, but inclined and vertical segments occur. Preserved in epirelief, endorelief and hyporelief. Cross-section irregularly cylindrical to vertically extended in form of a crude vertical spreite. Mostly found on tops of rippled beds, where they are preserved as positive epireliefs, formed as endogenic (often intergenic) burrows or full reliefs

Burrows are straight or curved and up to 17 cm long and 2–8mm wide. Width can vary owing to the occurrence of longitudinal or oblique ridges, wrinkles and striations. Linings are common. The burrows may cross-cut but true branching is not developed. Horizontal burrows are most prominent and crowded, though a few vertical shafts may be present at some terminations. Longitudinal sections exhibit typical long striae of claystone incorporated into the fine-grained sandstone.