P.A. Gatt writes: The Authors offer an interesting perspective on the weathering of limestone dimension stone used for masonry in Malta, also studied by Fitzner et al. (1997) and Gatt (2007). They conclude that a single parameter, namely the difference in marginal non-carbonate content, can be used to predict the durability to weathering in the pelagic sediments of the Lower Member of the Globigerina Limestone Formation, even in freshly cut stone that does not present visual differences. A geochemical approach is used to distinguish between a problematic stone characterized by strong differential weathering with rapid loss of volume,...

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