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A separate sub-sample (~1g) was used for laser diffraction measurement of the mud and sand fractions using a Malvern Mastersizer 2000, with results expressed as percentage of the total particle volume based on an average of three measurements on each sample. Summary statistics include arithmetic mean, standard deviation, skewness and kurtosis. Carbonate content was measured on the bulk fraction, sand fraction and mud fraction by acid digestion and measurement of resultant pressure, following Muller and Gastner (1979). The carbonate content of the gravel fraction was determined by visual assessment. Sediment data for the Oceanic Shoals Survey are a first generation product derived from the physical samples. No transformation of the data has been undertaken.", "geometryType": "esriGeometryPoint", "sourceSpatialReference": { "wkid": 4326, "latestWkid": 4326 }, "copyrightText": "© Commonwealth of Australia (Geoscience Australia) 2016. 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