Writers : Mahmoudy Gharaie, M.; Karimian Torghabeh, A.; Vahidinia, M.
Publishing Year : 1389

Abstract :

A detailed study of Rhizocorallium assemblages from the Late Santonian chalky limestone in the Kopet Dagh basin led to identification of Glossifungites horizon in uppermost part of the Abderaz succession. Rhizocorallium jenense shows straight, short and slightly curved U shape structure with almost protrusive spreiten. Scratches are very abundant, which are less continuous and non parallel on the marginal tubes and shorter scratches are visible on the spreiten. Rhizocorallium irregulare is scarce. It exhibits the form of straight to slightly sinus U shapes with scratch marks on the surface. The higher dominance of R.jenense than R.irregulare reflects high energy condition of the sea water. The presence of abundant Rhizocorallium traces in firm ground consistency reveal Glossifungites ichnofacies. The occurrence of dominant suspension feeding R. jenense and scarce deposit feeding R. irregulare reflects a high concentration of nutrients in the water column. Scratch mark casts suggest crustaceans as trace makers with some appendages in continuous contact with the substrate.

Subject List : Ichnofossil