470 GEOLOGY OF OHIO. 



rock, and the lime accumulated on the sides of the cracks. Had the 

 same water dropped into a cavern there would have heen formed stalac- 

 titeS/Of remarkable purity and beauty. The following is a detailed sec- 

 tion of the limestone group : 



Ft. In. 



1. Limestone, blue and hard 1 



2. Blue clay shale 1 



3/ Hard blue limestone 1 



4. Limestone, yellowish 8 



5. Hard blue limestone 4 



6. Blue clay 8 



7. Limestone, upper part blue, yellow at bottom- 4 



8. Blue clay 4 



9. Hard blue limestone 1 



10. Blue clay 1 



11. Hard blue limestone 1 6 



12. Blue clay 6 



13. Sandy limestone, with casts of mud cracks on the under side 8 



14. Blueclay 1 



15. Blue limestone 1 4 



16. Blue clay, thin limestone near top 6? 



17. Space not exposed (estimated) _ 10 to 15 



18. Sandstone 12 



Level of Muskingum River. 



Without doubt many of the layers of limestone would make excellent 

 quicklime. The thin layer of sandy limestone, No. 13, contains on its 

 under side fine casts of sun-cracks made by the drying of the clay under- 

 neath when it was surface mud. Some fine slabs showing these easts 

 were taken to the cabinet of Marietta College many years ago. The 

 place of the Coal Run seam of coal was supposed to be in the space No. 

 17, not exposed. No traces of the coal were seen. In the river bank 

 opposite Beverly is a fine exposure of limestone. The following section 

 was taken on the bank of the Muskingum, on the Dana farm, below 

 Beverly, the part below the water having been given me several years 

 since by Boylston Shaw, Esq., who made a boring for Mrs. Dana : 



It. In. 



1. Limestone 8 



2. Light blue clay (hot measured). 



3. Limestone 4 



4. Blue clay (not measured). 



5. Limestone- 10 



6. Blueclay 6 



7. Blue limestone 1- 



8. Blueclay 10 



9. Limestone 1 6 



10. Blueclay 3 6 



