Extended Data Fig. 5: TIMA (TESCAN Integrated Mineral Analyzer) and XRF analysis of T. miraclensis. specimens and surrounding rock matrix.
From: Ordovician marine Charophyceae and insights into land plant derivations
a, Transmitted polarized light micrograph, showing that fossil specimens of T. miraclensis are lighter than the matrix, TZ16-14-73-70 (1).b, TIMA mineral mapping of a, showing T. miraclensis preserved as calcite and distinguished from surrounding matrix occupied by clay minerals. c, TIMA elemental mapping of a, showing that T. miraclensis is deficient Si, whereas the matrix is enriched in Si relatively. d, Transmitted light micrograph of T. miraclensis, TZ16-14-73-70 (2). e-g, XRF elemental mappings of d. e, Both matrix and thalli are poor in Si compared to clay minerals that fill the microcracks. f, Thalli of T. miraclensis are poor in K compared to matrix, the clay minerals filling microcracks are enriched in K. g, Both matrix and thalli are poor in Al compared to the clay minerals filling microcracks.
