. Bulletin of the Geological Society of America. Geology. HANGING VALLEYS 231 in which the streams tumble precipitously down the steepened slope as a series of rapids, cascades, and falls (figures 2 and 3 and plate 38). The maturity of the hanging valleys proves that a long time was required for their development at a baselevel not far from the 900-foot level. There W Seneca L vAe \ - â -f i *r ' ''T *v,.,. â r^r*. Figure 1.âCross-section of Seneca Lake. Thr^e miles north of Watkins. Column of figures refers to elevation with reference to sealevel Vertical scale exaggerated about five times. a
. Bulletin of the Geological Society of America. Geology. HANGING VALLEYS 231 in which the streams tumble precipitously down the steepened slope as a series of rapids, cascades, and falls (figures 2 and 3 and plate 38). The maturity of the hanging valleys proves that a long time was required for their development at a baselevel not far from the 900-foot level. There W Seneca L vAe \ - â -f i *r ' ''T *v,.,. â r^r*. Figure 1.âCross-section of Seneca Lake. Thr^e miles north of Watkins. Column of figures refers to elevation with reference to sealevel Vertical scale exaggerated about five times. are two ages of gorges cut in the steepened slope, one distinctly post- Glacial, the other, being both broader and deeper and partly filled with deposits made by the Wisconsin ice sheet, evidently antedating the advance of this ice sheet. W //oo I0OO ' ,~=,B>~=34£2 7^^v^ E 600 ^* 500 ^^^^Pe/i'a 400 \ ⢠.â ''â 300 's'£i-''S';:'\\'.':'-'''r: 200 V.''.; .'â¢.â¢>:.\':>:': /OO â â 0 W\ V-'-- ':â¢â¢''!'⢠-/oo v.'- -200 â¢300 *$p: -400 ' '500 v':v -600 -700 / 080 Ft no hocK. Figure 2.âProfile along Watkins Glen Creek. Scale same as figure 1. The headwaters of the hanging valleys are far less mature than the lower reaches, for from the headwaters the valleys broaden downstream, while the valley walls become less steep. A gorge condition exists in many of the headwater tributaries, and the valley walls are almost uni- formly steep, indicating^that active erosion was in progress here when. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
