.. Key to the upper Devonian of southern New York; designed for teachers and students in secondary schools . Q^ o H> - g < ^ ol^ cs CDCD CDO 6^ 14 §5. ) - < ifj ! J l^ «3 O Highest of all the Portage rocks are the Oneonta shales andsandstones in the east, the Upper Portage sandstones of Cayngasection and to the west; 500 feet thick; fossils scarce. The Chemung Group.—The rocks of this group are sonamed from Chemung Narrows, Chemung county. (See Frontis-piece, PL I). They are at least 1,200 feet thick and consist ofgray shales and shaly sandstones often replete with large, well-preserv
.. Key to the upper Devonian of southern New York; designed for teachers and students in secondary schools . Q^ o H> - g < ^ ol^ cs CDCD CDO 6^ 14 §5. ) - < ifj ! J l^ «3 O Highest of all the Portage rocks are the Oneonta shales andsandstones in the east, the Upper Portage sandstones of Cayngasection and to the west; 500 feet thick; fossils scarce. The Chemung Group.—The rocks of this group are sonamed from Chemung Narrows, Chemung county. (See Frontis-piece, PL I). They are at least 1,200 feet thick and consist ofgray shales and shaly sandstones often replete with large, well-preserved fossils, especially brachiopods. (See PL IX-XIII).In the western part of the state there are several Rock citiesor outcrops of coarse conglomerates belonging to this group: theSalamanca, the Pope Hollow, the Panama and Charlotte con-glomerates. These coarser layers when struck in oil wells innorthwestern Pennsylvania are termed oil sands, since they areloose and porous and are veritable reservoirs of oil. In the Catskills the Chemung rocks consist of red and greenshales, sandstones and conglomerates, and form a part of whatwas onc
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
