. Bulletin - New York State Museum. Science. 1004 NEW YORK STATE MUSEUM /3.'G 7' 10' f%' of 5 feet and are succeeded by 18 feet of black shale and 30 feet of dark and light shales in thin layers. Rhinestreet black shales. As the lighter shales decompose more rapidly than the black, the latter predominate in the coloring and, specially in old exposures, give to this division the appear- ance of being a homogenous bed of black shale. The division has therefore been termed the Rhinestreet black shale from an exposure in the town of Naples. It is continuous from Yates county to Lake Erie, and, unl
. Bulletin - New York State Museum. Science. 1004 NEW YORK STATE MUSEUM /3.'G 7' 10' f%' of 5 feet and are succeeded by 18 feet of black shale and 30 feet of dark and light shales in thin layers. Rhinestreet black shales. As the lighter shales decompose more rapidly than the black, the latter predominate in the coloring and, specially in old exposures, give to this division the appear- ance of being a homogenous bed of black shale. The division has therefore been termed the Rhinestreet black shale from an exposure in the town of Naples. It is continuous from Yates county to Lake Erie, and, unlike all of the forma- tions below it down to the Onondaga limestone it increases in thickness toward the west. It is 20 feet thick in the Naples sec- tion, 58 feet in the Genesee river cliffs and 185 feet in the Lake Erie section. Fossils are exceedingly rare in these black layers except terrestrial plant re- mains, which are found occasionally, drifted together and forming small thin layers of impure coal. Fish remains have been found in this horizon at Sparta, Livingston co., and other locali- ties toward the east, and a few speci- mens of Lingula and an abundance of conodont teeth have been obtained from it. This bed is exposed in the cliffs on the east side of Smoky hollow and at the falls in the outlet of Silver lake at Gib- sonville, also at the cascade in Buck run and on Cashaqua creek at Tuscarora. It is the base of " the great development of green and black slaty and sandy shales with thin layers of sand- stone " between the Cashaqua shales and the Portage sand- stones to which Professor Hall gave the name of " Gardeau shale and ; «3'4. top of Upper falls soft sandstones flags and shales sandstone flags and shales dark shale sandy shale black shale bottom of Upper falls shales and flags top of Middle falls Fig. 4 Section from top of Middle Portage falls to abut- ments of bridge above the Upper falls. Stations 10, 11. Please note that the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
