On Concretions in the Red Crag at Felixstow, Suffolk

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Abstract
I place on the table a selection from a large assortment of a peculiar description of concretions obtained from the Red Crag at Felixstow, in Suffolk. In 1842 I was much puzzled to account for the nature of these concretions. At a cursory glance one might almost be inclined to pass them by as waterworn pebbles, as they lie abundantly interspersed among the comminuted shells which form the upper parts of the cliffs. I found more than one eminent geologist disposed to agree with me in considering them to be rolled masses of London clay which had been indurated subsequently to their deposition in the crag. On my again visiting Felixstow during the summer of the present year (1843), I determined to give them a particular examination; and although a formation which has been so thoroughly worked as the crag is not likely to afford a casual visitor the opportunity of gleaning much of novelty, I believe I have satisfactorily ascertained the origin of these concretions, and have added to the list of crag fossils the petro-tympanic bones of at least four species of Cetaceans. These latter, I am persuaded, have been overlooked among the many concretions of this formation. They are, however, of a different composition, and closely resemble, in this respect, the silicified fragments of bone so abundant in this locality.

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