rl08 NEW YORK STATE MUSEUM 



tion of the tilting occurred during the life of the lake. If such 

 moYement did occur in any considerable degree, it ought to be 

 shown by the northward increase of the vertical distance between 

 the upper and lower bars, ae this portion of the shore line lies 

 north of the outlet at Rome. 



Maps and profiles 



A rapid survey and mapping wae made of the constructional 

 features, as embankments, bars and spits, through about 30 miles 

 of the shore line. These features are shown on the accompany- 

 ing map (pi. 9). No attempt was made to trace the initial shore 

 lines, which lie at varying distances landward and are very 

 irregular, ae they are indefinite and useless for the present study. 



At frequent intervals profile cross-sections were made of the 

 several bars composing the beach. The location of such profiles 

 is indicated on the map, and they are also plotted on a chart for 

 comparison (pi. 10). On this chart the 25 profiles are numbered 

 from south to north, and they are correspondingly numbered on 

 the map. 



In the chart of profiles the vertical scale is five times the hori- 

 zontal, that is to say, the squares represent 50 feet vertically, and 

 250 feet horizontally. The numerals in two figures on the bar 

 crests of the profiles indicate the hight in feet above the low 

 ground at the edge of the sublacustrine plain; those in three 

 figures indicate the hight above sea. The location of the high- 

 ways and of the Rome, Watertown and Ogdensburg railroad are 

 indicated by suitable marks. The profiles of the chart are not 

 placed in their exact geographic relationship, either horizontally 

 or in the distance apart, but the highest bar, or the one farthest 

 landward, is given nearly the same position at the right side of 

 the chart. The distances between the cross-sections are given 

 in miles by the numerals placed between the profiles. The 

 straight line distance covering the 25 profiles is 26 miles; the 

 distance following the curves of the beach is about 28 miles. 

 On the diagram the profiles are divided Into several groiups, des- 

 ignated by letters, each group lying within a section of the shore 



