yes Dear sir, Mathias H. Köster. This microbial mediated dolomite is further inconsistent with stable isotopic data, XRD as well as i have recoded biomarker of such type of bacterias which causes formations of such carbonates.
Dear sir Kenneth M Towe, yes it is dolomite and microbial mediated carbonates are reported in world. as Examples of this microbially driven transformation are the carbonate-sulfur mineralizations of the Zechstein Formation (Upper Permian, Germany) (Peckmann et al.,1999), the Calcare di Base (Upper Miocene, Sicily) (Rouchy, 1981;McKenzie, 1985; Ziegenbalg et al., 2010, 2012) and the diagenetic carbonates of the Lorca Basin (UpperMiocene, Spain) (Rouchy et al., 1998).