36 - Charles Whittlesey of Cleveland, on : a 
There are but few measurements in my reach of the third and 
pete: ridges. In Huron County, south of Russelion, there are 
o low swells of land parallel with the shore, apparently about 
on a level with each other, and not much above the main ridge 
at vernal, which is reported at 120 feet. 
e third ridge, in Ridgeville, Cuyahoga — is =~ mile 
Seite from the second or “middle ridge,” and is not very 
prominent, rising six to ten feet ‘above the low vans “ this 
place it is 186 feet above the lake, or eighteen feet above the 
middle ridge, and eighty-one above the highest part of the north 
ridge in Avon, five miles north, 
The fourth or last and highest well defined Ridge. 
24 miles southwest of Ohio City, i . 178 feet. 
14 miles southeast of Ridgeville Centre ae ‘ee: alate 
West bank of west fork of Black ee Elyria, a 
Distance embraced, twenty-five miles 
The materials of the most southerly or interior ridge, are in 
general coarser than in des others, showing a more violent or less 
lasting aqueous action. This is observed everywhere at the 
west. The more acne the drift, the more does it exhibit the 
effects of strong currents in the transportation of large pieces of 
rock, in the sha ape of coarse gravel. The lower portions, espe- 
cially those that lie near the surface of the great Lakes, not only 
on Lake Erie, but on Michigan and Superior, are fine, argillaceous 
or marly, laminated, and with few pebbles. 
The terraces have not been as much noticed as the ridges, and 
consequently their height is not as well known. From Rock- 
port to Avon, the north ridge is upon the edge of a terrace, the 
foot from seventy feet above the lake, down to sixty feet; its 
crest from one hundred and five down to eighty-five. Directly 
opposite this, about five miles more inland, a considerable portion 
of the fourth or south ridge, (known as the “ Butternut ,’”) is also 
on a terrace of about twenty feet, on its northern face; in fact all 
the ridges partake of the nature of terraces, in places; the north- 
ern slope being generally the longest. But the geological com- 
position of the terrace on which the ridge rests is different, and 
either a rock or a drift of more compact and resisting kind. 
Between Newburg and Euclid, nine miles, the northern face of 
the terrace is very bold, its base from 120 to 150 feet, and its crest 
200 to 225 feet. It is here composed of fine grained sandstone 
’ Waverly), and blue and red shales. East of Euclid, the terrace 
Gees times divides into two, the lower one supporting the north 
idge. It is the same for several miles east of Willoughby, the 
the first or lowest terrace being about one hundred feet 
g 
and its base seventy to eighty feet, and formed of blue hardpan — 
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