Written reply to Dr Walsh by Dr Blundell: The division of Layers 1 and 2 into Neogene and Palaeogene does not depend on any supposition of the age of the post-Liassic sediments of the Mochras bore-hole. Although comparisons are made in the paper, it should be emphasized that the reflection characteristics of the stratified sequence of Layer 1 in St. George's Channel and of Layer 2 both differ from the Mochras sediments and even if they are of about the same age they are likely to have different lithologies.

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