Jennings : A Botanical Survey of Presque Isle. 



2U9 



the eastern third of the lake shore of the peninsula so that it may be 

 assumed that at least the interior part of Long Ridge was permanently 

 established during the period of high water of 1838, and that the 

 northern part was formed considerably later, probably during the 

 high water of 1858 to 1862. A survey of the peninsula, made by John 

 de La Camp in 1866, shows the outline of the ridge practically the same 

 as at present, considerable sandy plain having accumulated along the 

 western half, but towards the east it is separated from the lake by 



FROM A TRACING OF A SURVEY 

 MADE BY LIEUT BAYFIELD , ISI?*- 1818. 



BY COURTESY OF "THE U.S. WAR DEPT. 



Fig. 2. Presque Isle, 1818. 



merely a narrow beach. A projecting recurved spit at the point where 

 the ridge turns abruptly to the south is evidently to be recognized 

 to-day in the low narrow ridge which nearly divides the marsh " B." 

 At this place are cottonwoods sixteen inches or more in diameter, thus 

 indicating an age of at least thirty years. 



The oldest of the three components of Long Ridge projects consid- 

 erably to the west of Cranberry Pond and was somewhat eroded by the 

 lake prior to the erection of the Light House Jetty. This ridge is 

 covered by an almost pure white pine forest, the oldest of the trees 

 having reached a diameter of seventeen to eighteen inches, breast high. 

 This would indicate their age to be from one hundred and forty to one 

 hundred and fifty years, and, allowing forty years for the starting of 

 the pines, as will be explained shortly, the age of this part of the ridge 



