Lower Cretaceous orbitolinid assemblages from Central Iran yield various bioerosional structures. The omnipresent traces of different boring taxa and groups (e.g., sponges, calcimicrobes, incertae sedis) represent a characteristic feature of the investigated thin-section material. The assemblage can be attributed to the Entobia ichnofacies dominated by borings assigned to the activity of sponges. The boring galleries are often concentrated in a plane parallel to the test surface, along the boundary of the marginal and the central zone of the orbitolinid tests. The borings are observed in foraminiferan-dasycladalean wackestones to poorly washed-out packstones, which can be referred to a subtidal palaeoenvironment.
Schlagintweit, Felix; Bucur, Ioan I.; Rashidi, Koorosh; and Saberzadeh, Behnam
Bioerosive structures in orbitolinid foraminifera: examples from the Lower Cretaceous of Central Iran,
Studia UBB Geologia
Available at: http://scholarcommons.usf.edu/geologia/vol58/iss2/art1