Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . ecess in the bluffsis caused by the higher series of shales. The latter are covered by sand*stone strata of varying thickness, separated from each other by good coal is found in this horizon. Near the top we find massiveyellow sandstones overlaid by thin beds of shale and some white sand-stones. Throughout the group fragments of Inoceramus are very plenti-ful, but other fossils appear to b
Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . ecess in the bluffsis caused by the higher series of shales. The latter are covered by sand*stone strata of varying thickness, separated from each other by good coal is found in this horizon. Near the top we find massiveyellow sandstones overlaid by thin beds of shale and some white sand-stones. Throughout the group fragments of Inoceramus are very plenti-ful, but other fossils appear to be rare. On every side the beds are con-formably overlaid by strata of the Laramie Group. In speaking of theTertiary Groups of this region sections will be given showing the arrange-ment of strata at this locality. The thickness of the Fox Hills Grouphere is about 1,200 to 1,300 feet. POST-CRETACEOUS. Laramie Group. The Laramie Group has a wide distribution in this region. On thewest side of the anticlinal we can trace it northward nearly to WhiskeyGap. There the drift obscures all definition as to its termination, but Iam inclined to think that it juts directly against the granites of the. TT. S. (jeoloffioaZ Survey. -Plate V.
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