Fig. 9 in Oldest mickwitziid brachiopod from the Terreneuvian of southern France

Fig. 9. Preservation stages of mickwitziid Kerberellus marcouensis Devaere, Holmer, and Clausen gen. et sp. nov. in the Heraultia Limestone from the Montagne Noire (southern France). A. Original shell in dark grey. B. Phosphatic inner and outer coating of the shell, black line. C. Second phosphatisation phase with phosphatisation of lime and cementation of debris. D. Decay of original organic material of shell (and/or dissolution of possible original or of secondary diagenetic origin shell carbonate material during acetic acid treatment [see Clausen and Álvaro 2007; Álvaro and Clausen 2010]).