Science Advances

Supplementary Materials

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  • Paleoenvironment and petrography of the BIIc subgroup
  • Fig. S1. High-resolution SEM micrographs of the mycelial networks.
  • Fig. S2. Geological map of the SMMLL Basin and synthetic stratigraphic and chemostratigraphic column of the MMS.
  • Fig. S3. Optical micrographs of petrographic thin sections cut at the depth or in close vicinity of the fossiliferous sediment in BIIc8 (15) (BK 457b, 118.2 m) showing subaerial exposure feature and little to no compaction of fossiliferous dolomitic shale.
  • Fig. S4. Fluorescence micrographs of thin sections in the BIIc6 shale bed (controls of WGA-FITC staining specificity).
  • Fig. S5. Comparison of μFTIR spectra of fossil filaments, cyanobacteria, extant fungi, fossil sponge V. gracilenta, and α-chitin.
  • Fig. S6. SEM, TEM (HAADF) micrographs, and elemental (STEM-EDS) and mineralogical analyses (selected-area electron diffraction) on FIB foil #4984 sampled collected fossil filament and associated paragenetic mineral phases.
  • Fig. S7. Deconvolution of the C-XANES edge for fossil filament FIB foil #4984.
  • Table S1. μFTIR assignments based on the following references.
  • Table S2. Peaks detected in XANES at the C and N 1s edges and used for the deconvolution in fig. S7.
  • References (5258)

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