Figure 18. Field photographs of Early Triassic bedding surfaces with structures of possible microbial origin. (a) Flower-shaped structure in the pale-brown micritic matrix containing filaments, bivalve shell fragments, ammonoids and high-spired gastropods. (b) Kidney-shaped "twin" morphology characterized by an irregular, partly concentric structure, where micrite and sparite alternate. (c) Structures of different size, some of which grow on the margin of a previous generation. (d) Dark-grey, ovoidal, lenticular sparry calcite structure, filled by an argillaceous micrite, in pale-brown micritic matrix containing abundant filaments (probably sponge spicule remains).

Published as part of Korn, Dieter, Leda, Lucyna, Heuer, Franziska, Salimi, Hemen Moradi, Farshid, Elham, Akbari, Amir, Schobben, Martin, Ghaderi, Abbas, Struck, Ulrich, Gliwa, Jana, Ware, David & Hairapetian, Vachik, 2021, Baghuk Mountain (Central Iran): high-resolution stratigraphy of a continuous Central Tethyan Permian-Triassic boundary section, pp. 171-192 in Fossil Record 24 (1) on page 186, DOI: 10.5194/fr-24-171-2021, http://zenodo.org/record/12763779