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Durham University

Department of Earth Sciences


Publication details for Professor David Harper

Strang, K.M., Harper, D.A.T., Donovan, S.K. & Portell, R.W. (2018). Silicification of low-magnesium mollusc shells from the Upper Oligocene of Antigua, Lesser Antilles. Caribbean Journal of Earth Sciences 50: 37-43.

Author(s) from Durham


Silicified molluscs, namely the oyster Hyotissa and the scallop Aequipecten?, are commonly
preserved as silica in the carbonate successions on the island of Antigua. These fossil assemblages are located
within the Antigua Formation, above and adjacent to a variety of volcanic and volcaniclastic rocks, suggesting,
on geological grounds, an igneous source for the silica. Energy dispersive spectroscopy (EDS) and
cathodoluminescence (CL) have been applied to characterise the silcification and its conditions of formation
which may have been associated with hydrothermal activity.