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



185 



shale, in part clayey, and in part more firm, the latter with Lower 

 Silurian bryozoa. 



Farther north, towards Lewisburg, on the west side of the pike, 

 is the quarry belonging to Mr. William Turner. The lower half of 

 the quarry belongs to the upper half of the Dayton limestone as 

 exposed at the Weaver quarry northwest of Euphemia. It is a firm 

 blue rock where not weathered, and contains no intercalated chert 

 beds. Above this lies the more magnesian Springfield rock containing 

 Pentanierus oblongus. It is quarried for lime. 



29. Carl Quarry — about 3^ miles, a little west of south, from 

 Lewisburg is found the quarry of James Carl, some distance up a 

 small stream. The Clinton here is at least as thick as south of Lewis- 

 burg, 13 feet. At the quarry the Dayton limestone is exposed. The 

 blue clayey shale near the middle of the Dayton section, so well 

 exposed at the Weaver quarry northwest of Euphemia, is also seen 

 here. Above this clayey shale is found the upper half of the Dayton 

 lime stone section, containing in some layers abundant crinoidal remains. 

 Specimens of Pisocrinus gemmiformis and of a Stephanocrinus, apparently 

 St. osgoodensis, were found in this upper part of the Dayton stone. 



30. Crismatfs Quarry—half way between Carl's (marry and 

 Eaton, about three miles northeast of Eaton, at a place recently called 

 Rocky Point. Here the Dayton stone is exposed. 



31. Eaton. — West of town, in the creek bed, the dolomitic rocks, 

 elsewhere called Springfield and Cedarville beds, where distinguishable, 

 are well exposed. The characteristic fossils of this division of the 

 Upper Silurian are found. Pentamerus oblongus, and the form of 

 Calymene niagarensis, which belongs to this bed, are common. Below 

 this, towards the bridge across the creek, are found the upper beds of 

 the Dayton stone, firm, in regular layers, serviceable as flagging 

 stones, and without the interbedded chert layers seen at New Paris 

 and north of Fair Haven. 



32. Eaton, Clinton Quarry. — Going from Eaton southward, 

 about two miles on Seven-mile creek, a fine exposure is reached in the 

 neighborhood of the place where the P. C. & St. L. Railroad crosses 

 the creek. The Dayton limestone is light blue in color, looks dolo- 

 mitic, and seems to grade into the Niagara rock above, as it does 

 also at Ludlow Falls, where, however, it partakes more of the 



