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Here we provide evidence of these contributions in ooids from Carbla Beach, Shark Bay, Western Australia. Dark 100\u2013240\u2009\u03bcm diameter ooids from Carbla Beach contain two different carbonate minerals. These ooids have 50\u2013100\u2009\u03bcm\u2010diameter dark nuclei that contain aragonite, amorphous iron sulfide, detrital aluminosilicate grains and organic matter, and 10\u201320\u2009\u03bcm\u2010thick layers of high\u2010Mg calcite that separate nuclei from aragonitic outer cortices. Raman spectroscopy indicates organic enrichments in the nuclei and high\u2010Mg calcite layers. Synchrotron\u2010based microfocused X\u2010ray fluorescence mapping reveals high\u2010Mg calcite layers and the presence of iron sulfides and detrital grains in the peloidal nuclei. Iron sulfide grains within the nuclei indicate past sulfate reduction in the presence of iron. The preservation of organic signals in and around high\u2010Mg calcite layers and the absence of iron sulfide suggest that organics stabilized high\u2010Mg calcite under less sulfidic conditions. Aragonitic cortices that surround the nuclei and Mg\u2010calcite layers do not preserve microporosity, iron sulfide minerals nor organic enrichments, indicating growth under more oxidizing conditions. These morphological, compositional, and mineralogical signals of microbial processes in dark ooids from Shark Bay, Western Australia, record the formation of ooid nuclei and the accretion of magnesium\u2010rich cortical layers in benthic, reducing, microbially colonized areas.<\/jats:p>","DOI":"10.1111\/gbi.12558","type":"journal-article","created":{"date-parts":[[2023,5,25]],"date-time":"2023-05-25T04:11:30Z","timestamp":1684987890000},"page":"629-643","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Organic\u2010rich bimineralic ooids record biological processes in Shark Bay, Western Australia"],"prefix":"10.1111","volume":"21","author":[{"given":"Juliet Y. 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