618 GEOLOGY OF OHIO, 



No. 10. 



Carbonate of lime 72.82 



Carbonate of magnesia 5.99 



Alumina and iron 2.80 



Silicious matter 16.06 



Organic matter „ 1.75 



99.42 

 No. 11. 



Carbonate of lime 88.40 



Carbonate of magnesia 1.96 



Alumina and iron 3.80 



Silicious matter 5.40 



99.56 

 No. 12 shows the character of the Delaware stone in the northern part 

 of the county. The sample analyzed was the blue building stone of 

 Perris's quarry, in Perry township. It doubtless agrees with much of 

 the Delaware stone proper in composition, as it does in general appear- 

 ance. 



No. 12, 



Carbonate of lime 57.09 



Carbonate of magnesia 33.14 



Alumina andiron 2.97 



Silicious matter ■ 5.33 



Organic matter 88 



99.41 

 The analyses given above were all executed for the Geological Survej'' 

 Numbers 2 and 3 were furnished by Prof. Wormley; numbers 5, 6, 7, and 

 8 were made by Dr. C. L. Mees, now of Louisville, Kentucky ; and num- 

 bers 1, 4, 9, 10, 11, and 12 were executed by Mr. C. C. Howard, in the 

 laboratory of the Ohio Agricultural and Mechanical College. 



Application will be made of some of these analyses in treating of the 

 economical geology of the formation. 



3. Paleontology. — The Corniferous limestone is a great store-house of 

 iossils. Almost all limestones are of organic origin, but this shows its 

 origin in every layer. The substance of the rock is often composed of 

 the exquisitely preserved fabrics of the life of the seas of this distant 

 date. Sea- weeds and corals, chambered and univalve shells, bivalves and 

 brachiopods, were strewn indiscriminately upon the floor of this ancient 

 sea, and built it up thus by slow additions. Vast periods of time were 

 used in this work. The species that flourished when the earlier beds 

 were being deposited, had their day, and in many instances, gradually 

 disappeared long before the series was completed. New forms came in 

 from time to time, some of which are identical with species found in 



