Patagonichnus thalassiformis Olivero et López Cabrera, 2005

Revised diagnosis. (After Olivero & Lopez Cabrera 2005) Long,
dominantly horizontal and straight to curved, single, paired or multiple tubular branches and associated bulbs filled with conical or helicoidal, concentric laminae surrounding an intricate system of lined inner tubes. Horizontal parts may be connected with vertical and shorter backfilled branches. When the external backfilled structure is missing, the lined inner tube may form intricate, crowded gallery systems with numerous vertical and horizontal branches.