VI.—The Rock of the Cambridge Greensand

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Abstract
Examining the Cambridge sands, fresh from a remembrance of the Undercliff and the grand developement of the cherty rock of the Upper Greensand in Southern sections, perhaps its most marvellous character is that here it no longer makes a feature in the land, but has dwindled away to barely a foot in thickness, and yet is to be traced through several counties. Blending insensibly into the chalk, resembling in structure beds that sometimes occur in the Gault, it appears but as a parting seam between those deposits. Yet so soon as Dr. Fitton made clear the sequence of the Cretaceous beds, Professor Sedgwick recognised in the film of black nodules, glauconite and chalky marl, the analogue of the sands of the Vale of Wardour and the Isle of Wight.

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