72 PLANT SUCCESSION AND CROP PRODUCTION 



Erie and then northwest, north of Paulding County toward Indi- 

 ana and Michigan, and touching all the southern boundary lines of 

 spots of heaviest shading, will outline the old glacial Lake Maumee. 

 This is indicated on the Moraine chart (Figure 9, p. 47) by the 

 total absence of drift deposits since the land was covered with 

 water long enough to allow settlement and covering of coarse mate- 

 rial with a finer deposit from the lake. In post-glacial time this 

 territory has emerged. The finer soil deposits under water, and 

 the organic deposits of plants as the lake line retreated northward 

 to the present Lake Erie, are still of interest and importance to 

 us when we see in them a cause of increased land values. 



The second chart of land values as shown in Figure 15, is made 

 by eliminating the areas in which tax evaluation comes from the ac- 

 crued value of population in the cities. Since the farm land would 

 have no value if it were not for population, and since on the other 

 hand the climate and soils are underlying fundamental factors in 

 the values, to be fair, both charts must be shown. The second 

 chart is our real summary and illustrates the ecological conditions. 



