Fig. 5 in Orbitolinid Foraminifera From The Late Maastrichtian Of The Tarbur Formation (Zagros Zone, Sw Iran)

Fig. 5 Dictyoconella? minima Henson from the late Maastrichtian of the Tarbur Formation, SW Iran (Naghan section: a– b, j, l; Mandegan section: c–i, k, m–p). a Subaxial section. b, i, l Oblique sections. Note oval test outline in k. c–e, m Deep tangential sections displaying primary septules (beams) continuous from one chamber to the next. f Shallow tangential section displaying subepidermal network of beams and rafters. g, j, l, o–p Different transverse sections, some slightly oblique. Note five marginal foramina arranged in a radial circle (inside yellow marked rectangle), and oval test outline in j. h Subaxial section. Note alternation of pillars by stairway-like arrangement of foramina (yellow line) and opaque fused pillars/secondary deposits in the central zone. k Detail from h showing marginal foramina arranged in vertical lines between successive chambers. n Tangential-oblique section. Abbreviations: b = beam, ib = intercalary beam, fo = foramina, mf = marginal foramina, mt = marginal through, pi = pillar, s = septum. Thin-sections: Ng 196 (a), Ng 192 (b), Rt 108-3 (c–e, g, n), Rt 104 (f), Rt 96 (h, k), Rt 108-6 (i), Ng 187 (j), Ng 186 (l), Rt 107 (m), Rt 102-2 (o), Rt 104 (p).