The physical geography of New York state . n it would have been had it beennecessary to rise over the divide at Little Falls, instead ofpassing down a fairly uniform and moderate slope, mostlyover soft glacial and lacustrine, and possibly, in part, ma-rine THE HUDSON RIVER.—The Hudson is divisible into twoquite different parts: (1) the navigable section, from itsmouth to Troy, which is in reality an estuary reached bytide-water, and (2) the section upstream from tide-water,where it is a small but normal river, often interrupted byfalls and rapids. In these respects the Hudson is lik
The physical geography of New York state . n it would have been had it beennecessary to rise over the divide at Little Falls, instead ofpassing down a fairly uniform and moderate slope, mostlyover soft glacial and lacustrine, and possibly, in part, ma-rine THE HUDSON RIVER.—The Hudson is divisible into twoquite different parts: (1) the navigable section, from itsmouth to Troy, which is in reality an estuary reached bytide-water, and (2) the section upstream from tide-water,where it is a small but normal river, often interrupted byfalls and rapids. In these respects the Hudson is like allthe rivers that enter the ocean in the northeastern part ofthe continent, excepting that, in the case of the Hudson,the estuarine part is relatively longer and narrower thanin the case of most such streams. It takes but little study of this and other similar valleysto see that the upstream portion, above the tidal section,is the same in origin as the part occupied by the tide. 1 Taylor, Amer. Gcol., IX, 1892, 344; Upham, same, Fie. .(7. The lo\vl;uid (Jatskills ;mln>win^ Inof Hudson valley (photograph »( ni»i|,-l l,y K. K. Howi-11, \Va-liin^iii. 1. (185) 186 The Physical Geography of Ne-w York State They are in both cases valleys of erosion, and the occu-pation of a part of the valley by the tide water is duemerely to the sinking of the land which has allowed thesea to enter the valley, as it would enter any land valleyof the present if the land level should sink far valley has been partly drowned, and the river may besaid to be a drowned river near its mouth. There is otherevidence than that of the laud topography that this is thetrue explanation. At what period the Hudson River began its course is notcertain. It now cuts across formations of different kinds,some of them representing the very roots of planed-downmountains, formed as far back as the Silurian time (p. 24).It is evident that the river did not originally have such acourse as to have al
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