Abstract
The section of which an explanation is offered in this communication occurs about 2 miles west of Sunderland, and has been noticed by Messrs. King & Howse, and Prof. Lebour. The base shows the Permian Yellow Sands, which are succeeded at the western end of the section by the Marl Slate, thin-bedded limestones, and at the top crystalline limestones without any trace of bedding. At the eastern end the Marl Slate and thin-bedded limestones are absent, and except when a breccia intervenes the crystalline limestones rest on the Yellow Sands, though the thin-bedded limestones and Marl Slate show no signs of thinning out. There are also minor complications. The Author suggests that the section may be explained by supposing that denudation occurred in a cavern, the roof of which afterwards fell in, and that disturbances were also produced by ‘creep’-movements.

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