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Dolomite was observed, using petrography, X-ray diffraction (XRD), and scanning electron microscopy (SEM), in cored Neogene sediments from the Porcupine Seabight in the north Atlantic Ocean, Integrated Ocean Drilling Program Expedition 307 Sites U1316, U1317, and U1318, ~100 km off the west coast of Ireland. Trace amounts (<10% of total carbonate component) of dolomite were observed in Challenger Mound, a deep coldwater mixed silicaclastic-carbonate mud mound located in the Porcupine Seabight. Significant dolomitization (>50% of total carbonate component) was observed primarily in Miocene strata in submound and off-mound sediments. Petrographic examination of smear slides indicates that dolomite is composed of micrometerto decimicron-sized, limpid, rhombic crystals. XRD analysis indicates that the dolomite is calcium rich and poorly ordered. SEM confirms light petrographic analysis of size and morphology of dolomite crystals, and electron microprobe analysis indicates that the dolomite is ferroan and displays distinct compositional zoning. Microbes and associated microbial filamentous structures were observed associated with dolomite crystals. Saturation indexes of carbonate minerals calculated for interstitial waters collected from the three sites are consistent with the petrographic and XRD observation of dolomite. Introduction Challenger Mound (Belgica carbonate mound province) is located ~100 km off the southwest coast of County Kerry, Ireland, in water depths between 550 and 1025 m (Figs. F1, F2). Miocene sediments in the region are composed of mixed siliciclastics (silts and clays) and carbonates (nannoplankton and coldwater metazoan skeletal debris). These sediments are overlain by Pliocene to Pleistocene coldwater coral carbonate mud mounds and their laterally equivalent sediments. The mounds are analogous in their largescale geometry and position on the shelf margin to fossil carbonate mud mounds common in Paleozoic strata (Lees and Miller, 1995). However, the Neogene mounds are dissimilar to Paleozoic carbonate mounds in that they are composed of coldwater coral in a matrix of mixed siliciclastic and carbonate sediments. They also lack stromatactis structures or any evidence of submarine carData report: dolomite in Neogene sediments of the Belgica carbonate mound province, Porcupine Seabight, North Atlantic Jay M. Gregg2 and Tracy D. Frank3