MIAMI COUNTY. 4TO 



tte whole, with the subjacent formation, I refer the reader to sections at 

 the end of this article, showing the thickness of the stone at several of 

 the best exposures in the county. 



The other exposures of the Niagara are those at the quarries at Coving- 

 ington, and at Kerr's, and at Ellis', on Ludlow Creek. Good building stone 

 is obtained at all of these. At Kerr's and Covington, fine blocks are ob- 

 tained, containing very large and fine specimens of Pentamerus ohlongus; 

 trilobites of the species Calymene Blwnenbachi occur frequently here. The 

 quarry of Mr. Ellis, on Ludlow Creek, not many feet above the upper 

 part of the Clinton, contains stone in its lowest part approximating more 

 nearly to that of the Piqua quarries than any observed in the other quar- 

 ries. I am inclined to- believe it may be of the same age, and that it 

 really lies lower than the lowest beds quarried at Covington. 



Clinton Formation. — The horizon of this formation has been already 

 indicated. Whether the Clinton rises somewhat to the north or not, 

 I had not the instruments to ascertain. A plane drawn through 

 the upper portions of the cliffs at Charlestown, Col. Woodward's, Milton, 

 Ludlow Creek, and extending to the rock-bank of the Miami River, at 

 Bogg's Mill, in the edge of Shelby county, would nearly show the upper 

 limit of the Clinton. Whether this plane would be horizontal or not, 

 remains to be ascertained. I shall mention the principal exposures of the 

 Clinton. The cliffs referred to several times are in this formation; the sec- 

 tions given will show its thickness at the places named. The lime-kiln 

 quarry of Mr. John Brown is in the Clinton. The lime burned at these 

 kilns is very pure lime, strong, and valued highly by paper-makers, 

 who make use of lime to soften the straw used in the manufacture of 

 paper; at Mr. Rudell's, on the Tippecanoe and Carlisle road, and on the 

 farm of Mr. J. H. Harter, north of Honey Creek, can be seen good expo- 

 sures of the Clinton. On the roadside, at his gate, a very friable stone 

 may be seen, called sandstone; it is of a reddish color, and may be easily 

 crumbled in the hand. On this farm are cliffs of the Clinton about fifteen 

 feet in altitude. 



On the farm of the Massrs. Nooks th« Clinton has been quarried for 

 their own use. Here a Syringopora coral was highly developed and some 

 masses of Faviitella stelleta. The quarrying has been carried to a depth of 

 about fifteen feet, every where characteristic rock of this formation. 



The highest locality, in Lost Creek, where the shale underlying the 

 Clinton can be seen, is in a ravine on Mr. John Lefevre's farm, below the 

 old dam on the creek. 



In all exposures observed, the lower strata of the Clinton are of a 

 coarse and sandy nature. The characteristic unevenness of the bedding 



