400 
The Ohio A r aturalist. 
[Yol. IX, No. 2, 
100-200 yards. It is almost level each way, but descends about 
10 feet toward the river. It stands 20 feet above the river, and 
a steep serrate bluff rises back of it. Its top is a structural plain. 
All three of the above terraces have nearly continuous rock 
fronts, and quarries have been opened in two of them. 
Next down the river is the long narrow terrace on the west 
side just south of Rathbone. It is nearly one-half mile in length, 
descends 10 feet southward, but is almost perfectlv level from 
back to front. It stands 20-25 feet above the river with much 
outcrop on terrace front. An excellent structural plain. 
A mile farther down stream and on the east side mav be 
found a rock terrace nearly one mile long and from 50 to 150 
yards wide, 35-40 feet above the river, slopes gently toward the 
river, and descends 15-20 feet in its length. Only one other 
terrace studied is as high above the river as is this one. 
Opposite Dublin occurs a strong rock terrace about three- 
fourths mile long and from 20 to 200 yards wide. Its top is 
30-40 feet above the river and remarkably level, descending 
southward or down stream about 10 feet in its length. Some of 
the top is nearly bare; other parts are mantled with alluvium. 
Terrace front is a rock outcrop. A quarry long ago opened in 
the terrace near the Dublin bridge furnished building stone and 
lime, +he latter being burned in kilns on the terrace. 
On east side of Scioto just south of Hayden’s run, may be 
found an interesting terrace over one-half mile long and 100-200 
yards wide with its top full 40 feet above the river and very 
level. In northern half is much washed, calcareous gravel, but 
in southern half very little, usually none. Rock shows in terrace 
front in several places. Bluff rising behind the terrace is of 
limestone at base and deeply covered with drift. About in mid¬ 
dle of bluff and 15-20 feet above the terrace top are fine glacial 
striae on limestone. 4 These striae are about 800 feet above sea 
level and 100 feet below the upland surface of the vicinity. Bed 
rock occurs in Slate run to the south and in another run to the 
north 25—50 feet above the striae. There seems to be a buried 
valley here but it can not have been as deep as the present 
Scioto valley. It must have been as deep as the top of the 
striated ledge and it may have been as deep as to the terrace top. 
The gravel being largely calcareous and only locally developed 
is probably of post-glacial origin. Of course, if it were laid as 
glacial out wash, the terrace top upon which it lies must represent 
the bottom of an older valley. No striae have been found on 
any of the rock terrace tops. The gravel has been opened and 
worked at two points, and a quarry and crusher are in operation 
in the southern part of the terrace. 
4 Reported by W. C. Morse in 1906. 
