The. P}-e(iJ(icial Cuyahoga VaJleij. 177 
most prominence to a well drilled by the Standard Oil Co. at 
the mouth of Kingsbury's run, (a small stream emptying into 
the Cuyahoga river about two miles from its mouth) which 
reached I'ock at a depth of 238 feet. As the mouth of this well 
is about ten feet above the level of lake Erie, this would give 
the bottom a depth of 228 feet below this level, and also show 
the existence of a preglacial valley much deeper than that of 
the present Cuyahoga. Since that time many borings have been 
made in all parts of the city and adjoining townships, which 
throw much new and interesting light on this preglacial valley 
and its location. If the results of these more recent borings 
have appeared in any writings on the geology of the region, I 
am not aware of the fact. The latest work on this subject, to 
my knowledge, is by Prof. Warren Upham, on "The Preglacial 
and Postglacial valleys of the Cuyahoga and Rocky rivers." 
in which he gives the maximum recorded depth of the pregla- 
cial Cuyahoga at 228 feet below the level of the lake. Also Dr. 
J. W. Spencer in his work "History of the Great Lakes," writ- 
ten in 1894, gives the same figures, 228 feet, as showing the 
greatest known depth of lake Erie. 
The object of the present paper is to compile the records of 
more recent borings and present the results as shown b}' them. 
In this, much assistance has been freely given by Mr. F. S. 
Gilbert, contractor and driller of this city, who has a record 
of many of the deepest wells.* 
The result of these subsequent borings has been to bring to 
light three prominent facts: First, that the ancient gorge is 
very much deeper than formerly supposed ; second, that the 
greatest depth j^et shown by the drill is near Gordon park, about 
five and one-half miles to the east of the present mouth of the 
river; third, that the line of deep drift which fills the [)re- 
glacial valley extends approximately northeast to southwest 
from near the east side of Gordon [)ark, past Forest City park, 
as located on the accompanying map. 
*Mr. Gilbert has kindly furnished thn following additional confinua- 
tion of the details here given: 
At the request of Mr. S. J. Pierce, I write to verify the records of sev- 
eral wells which I gave him. I have read a copy of his paper and 
also examined the profile view of this valley. lu regard to both I would 
say that the records arc correct. These borings have been made by me, 
and cover a period of seventeen years. F. S. Gilbert. 
Cleveland, O., June 9, 1897. 
