350 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



This much is certain, however, that gravel deposits are rare above the 

 moraine and very abundant below it. The height of the terrace at the 

 border of the moraine is about 30 feet above Todds Fork, and it is about 

 the same at Clarksville. At a railway switch about midway between 

 Clarksville and Hicks station it rises 40 feet or more above the creek. In 

 the vicinity of Hicks station it is 40 to 50 feet, while along the north- 

 flowing portion of the creek, 1 to li miles above its mouth, the terrace 

 stands about 60 feet above the creek. It continues down Little Miami 

 River, being well exposed in the south bluif for 2 miles below Morrow. The 

 descent of the terrace near its head is about the same as that of the creek, 

 18 to 20 feet per mile, but farther down it is less rapid. From Clarksville 

 to the exposure a mile above the mouth of the creek, its descent is about 

 130 feet in 10 miles. The fall of the present stream in the same distance 

 is 160 feet. 



The Cincinnati and Muskingum Valley Railway has opened a gravel 

 pit in the terrace near its head, about a mile above Clarksville. It exposes 

 3 or 4 feet of sandy gravel at top, beneath which is gravel with but little 

 sand intermingled, exposed to a depth of about 20 feet. It is horizontally 

 bedded and contains many pebbles 3 to 4 inches in diameter. Much of the 

 gravel is well-rounded local limestone, but Canadian rocks are not rare. 

 At Clarksville a well on the terrace at the Hadley House, 20 feet iu depth, 

 did not reach the bottom of the gravel. It was described by Mr. Hadley 

 as containing coarse gravel with pebbles 3 to 4 inches in diameter, thin beds 

 of fine gravel being- interbedded with tlie coarse. Mr. A. W. Thomas has 

 a well on the lot adjoining the Hadley House which reached the bottom 

 of the gravel and entered a blue shale at 20 feet. 



At the exposure near the mouth of Todds Fork the upper 20 feet 

 consists of well-rounded gravel containing Canadian as well as local pebbles. 

 Few pebbles exceed 3 inches in diameter, and there is much fine gravel and 

 sand intermixed with the larger pebbles. There is no silty capping here 

 such as occurs near Clarksville. Below the gravel for about 20 feet there 

 is a poorly assorted material in which many slabs of local limestone occur, 

 and beneath this is about 20 feet of blue till. The till apparentlv fills a 

 narrow gorge in the rock strata, for a few rods up stream from the deposit 

 of blue till limestone strata are exposed which rise to the level of the top 

 of the deposit. 



