. Scottish geographical magazine. egon Short LineRailway has utilised the notch in the basin rim and the slope of theBonneville River for its road-bed. The dimensions of the old channel and the corrosion phenomenaconclusively show that Bonneville River must have been of great 1 Lake Bonneville, p. 171. LAKE BONNEVJLLE—PREDECESSOR OF THE GREAT SALT LAKE. 461 volume, and, as to flow, a veritable torrent. It has been compared withNiagara River as a similar stream. Concerning the probable durationof the river at its maximum volume, that is, concerning the timenecessary for the lowering of the lake
. Scottish geographical magazine. egon Short LineRailway has utilised the notch in the basin rim and the slope of theBonneville River for its road-bed. The dimensions of the old channel and the corrosion phenomenaconclusively show that Bonneville River must have been of great 1 Lake Bonneville, p. 171. LAKE BONNEVJLLE—PREDECESSOR OF THE GREAT SALT LAKE. 461 volume, and, as to flow, a veritable torrent. It has been compared withNiagara River as a similar stream. Concerning the probable durationof the river at its maximum volume, that is, concerning the timenecessary for the lowering of the lake to the Provo level, the author ofLake Bonneiille has written : How long the discharging river maintainedits colossal dimensions cannot be learned, but the period certainly wasnot great. The entire prism of water between the Bonneville and Provoplanes would be discharged by the Niagara channel in less than twenty-five years; and if the Bonneville River reached a greater size, it couldhave maintained it only for a shorter Fig. 5.—Terrace gashed traiisverselj- l)y later erosion, Traverse Mountains, level of Lake Bonneville. Shore Deposits. As local conditions have determined, the old lake shores have beencut by waves, or have been covered by deposits resulting from streamand littoral current action. Terraces, alluvial cones, and deltas attestthe eflficienc} of these agents in both destructive and constructivephenomena. Alluvial cones of many degrees of slope, the flatter kinds distinctivelyknown as fans, appear at the mouths of ravines debouching upon theplains. Of these deposits many were evidently constructed prior to the 1 Lake BanneviUe. p. 177. 462 SCOTTISH GEOGRAPHICAL MAGAZINE. Bonneville epoch ; while others, by the absence of shore lines and lakesediments, show that they date from a period later than that of the lakerecord proper. In Salt Lake Valley and elsewhere, the cones and fans,issuing from the numerous canyons and ravines at short intervals,
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