Hubbert and Rubey [GeoScience Abstracts 1-367, 1-368] reviewed occurrences of fluid pressure approaching total overburden pressure in sedimentary rocks, particularly clayey sediments, and suggested that such high fluid pressure is capable of greatly reducing internal friction in the rock and thus facilitating the formation of low-angle thrust faults. Although their principal source of water is within the sediments, connate water, and their principal source of pressure is the weight of overlying sediments, they mention metasomatic and magmatic fluids and the processes that produce these fluids as possible additional sources. Intrusive or remobilized granitic rock is here considered as a source of the water under high pressure because this source has the advantage that it may arrive any time after the stratigraphic seal has been made. Hence thrusting need not occur immediately after a climax of sedimentation. Several possible examples are discussed, and one or two appear reasonable.