1. Abel O (1935) Vorzeitliche Lebensspuren. Gustav Fischer, Jena, 644 p
2. Abletz VV (1993) Trace fossils of Acrothoracica (Cirripedia) from the Eocene of the Krivoy Rog Basin. Paleontol J 27:73–80
3. Abletz VV (1994) Borings of phoronids from the Eocene of the Ukraine. Paleontol J 28:155–160
4. Ager DV, Walace P (1970) The distribution and significance of trace fossils in the Uppermost Jurassic rocks of the Boulonais, northern France. In: Crimes TP, Harper JC (eds) Trace Fossils. Geol J Spec Issue 3. Seel House Press, Liverpool
5. Agirrezabala LM, de Gibert JM (2004) Paleodepth and paleoenvironment of Dactyloidites ottoi (Geinitz, 1849) from Lower Cretaceous deltaic deposits (Basque-Cantabrian Basin, west Pyrenees). Palaios 19:276–291