372 GEOLOGY OF OHIO. 



the N. W. \ section 19, at the "Rocky Ford," the Niagara appears in the 

 Middle Branch of the Portage. It is of a dark drab or dirty gray color, 

 in thick, crystalline beds, showing a roughened, water-worn surface. It 

 is pitted with innumerable dish-shaped depressions, or "thimble-holes," 

 apparently excavated by sand agitated by water. Bare surface rock is 

 exposed on N. W. \ section 16, land of David Wyrick, Thomas McCuen, 

 and of Solomon Smith ; also N. W. J section 7, in the form of a ridge, 

 and in the creek, land of Joshua Yeaman ; als6 S. W. \ section 23, land 

 of George and Samuel Schlotterbeck, of Peter Zigler, and David Hays. 

 This rocky patch extends westward three or four miles, visible especially 

 along the north side of the ridge. On the N. W. \ section 5 is a Niagara 

 ridge, partly owned by George Gorton and John Low. On the southern 

 part of the same section it is exposed on the land of Mr. Stackhouse and 

 of Reason Whittaker. Near Bloom Center, ,on sections 15 and 22, it out- 

 crops on land of Rheinhardt and Alfred Simons, of Marvel Dennison, 

 and of James Frey. It also is exposed on land of Robert McKay, S. W. 

 \ section 7. It also occurs bare over several acres in section 6. At 

 Shiloh village (section 4) there is a considerable deposit of sand, evenly 

 spread over many acres. 



The exposures of the second area of Niagara, which occupies the plateau 

 in the center of the county, are of a similar character to those already 

 enumerated of the area in the south-eastern part of the county, but are 

 generally less denuded of the Drift, and more extensively covered or ac- 

 companied by lake sand. 



In Liberty township it appears in outcrop in the vicinity of Portage, 

 and in N. E. \ section 1, where it was encountered at a short depth below 

 the surface in ditching by the side of the road. It is here a firm, thick- 

 bedded, crystalline, gray rock, which can be obtained in large blocks. 

 Through sections 12, 11, 10, and 9 its strike is indicated by the rapidly 

 rising ascent from the valley of the Portage north-westward, although 

 there is no -known outcrop of the rock. This elevation is more or less 

 constantly surmounted by a sandy deposit, which also is said to extend 

 some miles further south into Milton township. It runs also, with in- 

 terruptions, along the left bank of the Portage north-westward to Scotch 

 Ridge, where there is one of the most remarkable deposits of beach sand. 



In Plain township the Niagara is laid bare in S. E. \ section 25 by 

 ditching along the road; dip, south-east. On sections 1 and 2; east of 

 Tontogany, are sudden ridges of Niagara limestone, that on the former 

 holding a deposit of sand. That on section 2 is on the farm of Jerome 

 and Silas Thomas ; that on section 1 is opened and burned for lime by 

 Clarendon Nye, the product being about three thousand bushels per year. 



