Mean grainsize of surface samples collected from the leeward, off-reef physiographic zone of Wistari Reef

Wistari Reef is a lagoonal platform reef, situated on the Tropic of Capricorn, within the Capricorn and Bunker region of the southern Great Barrier Reef. Six surface samples were taken from the leeward, off-reef area and analysed to determine mean grainsize and the sorting coefficient (expressed as the standard deviation of grainsize). Results indicate that the off-reef area has an average mean grainsize of ~1.16phi, with an average sorting coefficient of 0.89phi.