An Account of the Middle Silurian Rocks of Ohio and Indiana. 



167 



1. Winchester. — About two miles south of Winchester on the 

 farms of Clinton Masters and W. T. Carson, are exposures of Upper 

 Silurian rocks. On the east side of the road just south of a very 

 small stream the Dayton limestone is exposed. It is yellowish in 

 color and not very firm, but it comes out in regular courses and is 

 therefore quarried. Immediately beneath occurs the Clinton, 

 containing Calymene vogdesi i large form, Orthis {Herbertella) 

 day tone fisis i well defined, boih valves, Orthis {Platystrophid) biforata, 

 Orthis {Dalmanelld) elegaiitula, Heliolites megastoma ? f Fcwosites 

 niagarcnsis, Halysites catemdatus i and PtychophyUum ipomtxa. On 

 the west side of the road, the middle and lower parts of the Clinton 

 are exposed in the bed of the stream, the total thickness of the 

 Clinton being estimated at about thirty feet. The lower part of 

 the Clinton is a reddish crinoidal rock. Immediately beneath occurs 

 a bluish rock, the Belfast bed. Unfortunately the thickness of this 

 bed was not recorded, but it was about four or five feet thick. 

 Beneath it occurred blue clay, and, lower down, the limestones of the 

 undoubted Cincinnati formation. 



2. Peebles. — The ripple marks in the Springfield rock, about a 

 quarter of a mile west of Peebles, along the railroad, occur at a level 

 of at least thirty feet above the Niagara shales. The shales are at 

 least 40 feet thick. Underneath them occurs a rubble-stone. The top 

 of the Dayton limestone lies 45 feet beneath the shale. The Dayton 

 limestone has a thickness of three feet. The Clinton seems to be 40 

 feet thick. There is no stone corresponding to that elsewhere found 

 beneath the Clinton in this part of the state, called the Belfast bed. 

 The Cincinnati rock immediately beneath the Clinton contains how- 

 ever the same annelid teeth found elsewhere in the Belfast bed. The 

 rubble stone above mentioned corresponds in a general way to the 

 brownish or bluish rock which occurs elsewhere in well defined layers 

 above the Dayton limestone, but which is unsuitable for building pur- 

 poses on account of its ready deterioration and breaking up under the 

 influences of weathering. 



3. Kelly 's Mill. — About three and a half miles southeast of Bel- 

 fast, on the road to Loudon, where it crosses Brush creek, occur 

 exposures of the Belfast bed. The best of these is on the northside of 

 the creek along the west side of the road. The Belfast bed is here 72 

 inches thick. It is overlaid by a few inches of Clinton limestone. 



