252 Proceedings of the O/iio Sfdfc .Icadeiuv of Science 



Ikit at the present time, a high level bridge is under con- 

 struction ; this is being built across the Cuyahoga on the delta- 

 top level; it is a part of the recently located "Belt Line" which 

 has become the property of the Lake Shore Railroad Company. 

 From the standpoint of engineering, this is a hazardous venture, 

 a fact which in the light of thousands of dollars spent by this 

 com])any in the last year, much of which has been sunk in the 

 slumping quicksands of this old delta, needs no further comment. 



A vital question today in every large American city is speedy 

 transportation for the urban part of its citizens. This fact has 

 led to the construction, in many large centers of population, of 

 subways. For the most part subways in the city of Cleveland 

 would have to be cut through this old delta. Such an under- 

 taking will doubtless present new questions to subway engineers. 



This particular part of the southern shore of Lake Erie, if 

 one can clearly interpret the present movement of industry, is 

 destined to be the most thickly populated portion of Ohio. The 

 lake plain here, so far as the city of Cleveland is concerned, even 

 now is too narrow. It is probable that in this assured develop- 

 ment many physiographic reactions, new to this region, will 

 arise. This whole composite of conditions, then, is the result of 

 a pre-glacial physiography upon which has been imposed the 

 work of three lake levels, and which is becoming still further 

 complicated by the shore line now in the making. 



BIBLIOGRAPHY. 



Gilbert, G. K. 



"Surface Geology of the Mauniee Valley," Gcol. Surv. Ohio, vol. i 

 (1873), pp. 537-56. 



Heckewelder, John 



Map of Northeastern Ohio, U'rstcni Rcscrz'c Historical Society, 

 Tract 64 (1884). 



Leverett, Frank 



"Correlation of ]\Ioraines witli Beaches on the Border of Lake 

 Erie," The American Geologist, vol. xxi (1898), pp. 195-09. Mono- 

 graph, xli (1902), U. S. Gcol. Surv., "Cleveland Moraine," pp. 619- 

 51: "The Glacial Lake Maumee," pp. 732-35; "The Glacial Lake 

 Whittlesey," pp. 752-55; "The Glacial Lake Warren," pp. 763-64. 



