Bulletin - New York State Museum . page 80. The structure of the Jones Point terrace sio far as revealed isithat of a gravel bar building southward by the carriage ofgravels over the surface of an embankment which must havebegun to form where the terrace is tied on to the mountain side lOS NKW YORK STATE MUSEUM at or iioar its pivsoiit norilnrii end. These gravels coming torepose on the terminal slope under water formed successiveinclined stratified additions to the deposit in this direction. Thebase of the deposit toward the southern end is sand and fine siltor rock-flour almost clayey in con
Bulletin - New York State Museum . page 80. The structure of the Jones Point terrace sio far as revealed isithat of a gravel bar building southward by the carriage ofgravels over the surface of an embankment which must havebegun to form where the terrace is tied on to the mountain side lOS NKW YORK STATE MUSEUM at or iioar its pivsoiit norilnrii end. These gravels coming torepose on the terminal slope under water formed successiveinclined stratified additions to the deposit in this direction. Thebase of the deposit toward the southern end is sand and fine siltor rock-flour almost clayey in consistency. This finer materialrepresents that which was washed off to the bottom at the footof the gix)wing embankment this being pushed out into the opc^nwater in that direction. These materials formed horizontal bedsin front of the growing deltalike bar and were successively en-croached on by the foot of each layer of inclined gravel and sanddeposited on the growing slope of the bar. In this way origi- S N ^3? •^ .-. •• -,. Fiff 10. Section at southern end of Jones Point terrace in July li)0(X showing- at basehorizontal bedsof (1) sand, and rock-Hour, overlain by southward inclined beds (dip 30°), of(i) coarse g-ravel with cobbles uj) to 6 inches, and {i) tine gravel up to 3 inches. nated the unconformity at the base of the inclined beds. Therewas no erosion of the horizontal beds for they were in thedeeper water willi strong ( un-eiits moving only near the occurrence of coarse cobbles ranging up to 6 inches indiameter in these foreset beds nearly half a mile from thenorthern end of the embankment is evidence of strong currentsrunning to the southward and on the concave shore of theju-csent Hudson river wlicic under existing conditions or with ahigher water level it is difficult to conceive of a current of theriver working at the level of this deposit being so directed as toproduce the observed result. There ai)pear to be but two pos-sibilities concerning th
Size: 2113px × 1182px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
