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Throughout the world, there is a sudden extinction of a large number of taxa, including the dinosaurs, at the geological boundary known as the K-T (Cretaceous – Tertiary) boundary.

These units were overprinted by potassic alteration and host economic copper-(Mo–Au) mineralization.Harris’s paper is rather disjointed and I can see no better way to address its fallacies than by categorising my comments into those about the quality of the essay and the errors of fact and reasoning it contains.In order to put the rest of the argument in context, I include here a very brief review of the background to Harris’s claims.The initial stage reveals E–W extension associated with N–S compression, whereas the younger granodiorite dyke was emplaced during subsequent N–S extension.The large-scale switch of the extensional stress regime during the mineralization was favourable for ore deposition by channelling the fluids and increasing the effective permeability. Robert Moritz and Denis Fontignie contributed to the Sr/Nd and trace element analytical data of sample Av Q038.

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