CUYAHOGA PREGLACIAL GORGE IN CLEVELAND. 7 



the head of " Poags hole," and thence to Burns, observing en route features of 

 glacial, lake and stream origin which are regarded as having been formed at the 

 time of the fifth and sixth stages of Genesee glacial waters, when they found an 

 outlet through this locality to the Susquehanna. The party spent the night at 

 Portage. 



After a view of the gorge of the Genesee at Portage and an opportunity for see- 

 ing how a preglacial gorge had been filled with drift, diverting the course of the 

 stream, the party went by rail to Alden. Here they followed a southern branch 

 of the Crittenden beach eastward to the county line, thence went northward to the 

 Crittenden beach proper, which was followed to Crittenden station. The party 

 remarked that the beaches which they had seen at East Avon equalled in dis- 

 tinctness those which the}' found here. 



Thursday evening the party deviated from the plan, as laid down in the circular 

 for Friday and Saturday, on account of the absence of Mr Leverett and the re- 

 duced number. The party took train via Buffalo to Hamburg, where the heavy 

 Warren beaches were inspected. The members then became the guests of Mr B. 

 W. Law, at North Collins, who entertained them not only for the night, but like- 

 wise for the next day by driving about the region, giving excellent opportunities 

 for the examination of the high terraces along the Cattaraugus creek, and for in- 

 specting one of the most interesting postglacial gorges of the district. 



Announcements were made concerning the excursions, work, and 

 entertainment of the following week. 



The President announced the scientific program in Order, and the 

 Secretary read the following papers by title, in accordance with the plan 

 of the meeting : 



SHEETFLOOD EROSION 

 BY W J MCGEE 



The paper is printed in full in this volume. 



CUYAHOGA PREGLACIAL GORGE IN CLEVELAND, OHIO 

 BY WARREN UPHAM 



Contents 



Page. 



Introduction 7 



Records of wells in the glacial drift 8 



Probable drainage conditions of the Lake Erie basin before the Ice age 11 



Epeirogenic movements during the Quaternary era 11 



Deposition of glacial and modified drift in Cuyahoga valley and Lake Erie basin 12 



Postglacial river erosion in Cleveland and along the bed of lake Erie 13 



Introduction. 



Since the publication of my paper on the " Preglacial and postglacial Valleys of 

 the Cuyahoga and Rocky Rivers," * read at the last meeting of this Society, infor- 

 mation has been supplied by Mr S. J. Pierce, of Cleveland, derived chiefly from 



* Bull. Geol. Soc. Am., vol. vii, pp. 327-318, with map and sections. 



