. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 158 DELTAS IN LAKES. Fig. Deltas may be divided into three kinds: 1. Those which are formed in lakes; 2. Those in inland seas; 3. Those on the borders of the ocean. 1. Deltas in Lakes. Lake of Geneva.—This lake is about 37 miles long, and from two to eight broad; the shape of the bottom being very irregular, the depth varying from 20 to 160 fathoms. The Rhine, where it enters at the upper end, is turbid and dis- coloured ; but its
. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 158 DELTAS IN LAKES. Fig. Deltas may be divided into three kinds: 1. Those which are formed in lakes; 2. Those in inland seas; 3. Those on the borders of the ocean. 1. Deltas in Lakes. Lake of Geneva.—This lake is about 37 miles long, and from two to eight broad; the shape of the bottom being very irregular, the depth varying from 20 to 160 fathoms. The Rhine, where it enters at the upper end, is turbid and dis- coloured ; but its waters, where it issues at the town of Geneva, are beautifully clear and transpa- rent. An ancient town, called Port Vellais, once situated at the water's edge at the upper end, is now more than a mile and a half inland; this in- tervening alluvial tract having been acquired in about eight centuries. The remainder of the delta consists of a flat alluvial plain, about five or six miles in length, composed of sand and mud, a little raised above the level of the river, and full of marshes. In the centre of the lake, the depth of the water is from 120 to 160 fathoms, and it begins to grow shallower about a mile and three quarters from the mouth of the Rhine, through which space the fluviatile mud is always found at the bottom. Along this gradual slope, then, of 2 miles in length, the alluvial deposites are made; and if we could obtain a section of the accumulation formed in the last 800 years,* we should see a series of strata, * De la 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 Lee, Charles A. (Charles Alfred), 1801-1872; Draper, Daniel, 1841-1931, donor. DSI. New-York : Harper & Brothers
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