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. 2020 Jun 8;117(25):14005–14014. doi: 10.1073/pnas.1916673117

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Fig. 7. — Petrological characteristics of laboratory-synthesized microbial dolomites and Doushantuo dolomites from drillcore ZK312-P312. (A) Spherulitic grains of microbial dolomite. Republished with permission of Geological Society of America, from ref. 40; permission conveyed through the Copyright Clearance Center Inc. (B) Spherulitic grains of Doushantuo dolomites in a typical sample (ZK312-310), which yielded a clumped-isotope–based paleotemperature (T_Δ47) of 75 ± 4 °C. (C) Raman filter map of selected area in B showing distribution of dolomite (green), surrounded by OM (red) and apatite (blue). (D) Selected average Raman spectra from C showing close association between dolomite [diagnostic peak D(ν₁)], OM [diagnostic peaks O(D) and O(G)], and apatite [diagnostic peak A(ν₁)]. (E) Well-preserved microfossils of a typical sample (ZK312-310). (F) Well-preserved OM associated with abundant mycelia and mycetomes in a typical sample (ZK312-293), which yielded a T_Δ47 of 85 ± 7 °C. Note: Photo in B is a transmitted-light petrographic image and photos in A, E, and F are SEM images.