TABLE OP CONTENTS. ' 7 



ILLUSTRATIONS 

 PLATES 



I. A Sciotoville clay with Anthony coal above. Along Baltimore and Ohio 



Southwestern Railroad near Gephart, Scioto County 20 



B Breccia of Maxville limestone on Harrison ore horizon. Lucasville, 

 Pike County. 



II. A Boggs limestone in stream bed; Lower Mercer limestone protruding 



from bank. Blunt Run, Muskingum County (Locality 27) 40 



B Boggs limestone below, with Lower Mercer limestone and Middle 

 Mercer coal above. Exposure along Wheeling and Lake Erie 

 Railroad near Rock Cut, Muskingum County (Locality 28). 



III. A Lower Mercer limestone along Wheeling and Lake Erie Railroad near 



Rock Cut, Muskingum County (Locality 28) 64 



B Lower Mercer limestone in bed of Licking River at Zanesville, Mus- 

 kingum County. 



IV. A Upper Mercer limestone and black flint with Bedford coal below. 



West of Warsaw, Coshocton County 104 



B Upper Mercer limestone represented largely by black flint along a 

 small stream south of Symmes Ford, Madison Township, Mus- 

 kingum County. 



V. A Projecting ledge of Putnam Hill limestone with Brookville coal below; 



Tionesta coal, shown by dark streak, a few feet above road. Dug- 

 way at Putnam Hill, Zanesville, Muskingum County 126 



B The Carl Crabtree mine in which Tionesta clay is mined for the general 

 market. Putnam Hill limestone exposed about 15 feet above the 

 mine. Blunt Run, Muskingum County (Locality 27). 



VI. Illustrations of fossils 276 



VII. Illustrations of fossils L 278 



VIII. Illustrations of fossils 280 



IX. Illustrations of fossils 282 



X. Illustrations of fossils 284, 5 



XI. Illustrations of fossils ,. 286 



XII. Illustrations of fossils 288 



XIII. Illustrations of fossils 290,291 



XIV. Illustrations of fossils 292 



XV. Illustrations of fossils 294 



XVI. Illustrations of fossils. _. 296 



MAP 

 Map showing outcrop of Pottsville formation in Ohio 9 



