218 



GEOLOGICAL RECONNOISSANCE 



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L | I. 



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Black bituminous shale 



I L I 



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I L I 

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400 



Snbcarboniferous or cavernous limestone, with 

 intercalations of sandstone and shale; con- 

 tains large d< posits of manganese, some iron, 

 and copper pyrites. 



7 5 Massive saccharoidal sandstone. 



period; where it crops 

 out, north of Rocky Point 

 post-office, it has a thick- 

 ness of about twenty 

 feet. It is quite iossilife- 

 rous: the most abundant 

 fossils are, Producius 

 cora, and P. chgans. One 

 layer, full of entrochites, 

 is hard enough to take a 

 polish, and the fossils 

 generally showing white 

 on a black ground, it will 

 make a handsome mar- 

 ble for ornamental pur- 

 poses. This limestone is 

 usually underlaid by the 

 dark shales (»■) of the 

 section. 



Sandstone (/) is buff- 

 colored, and rather soft; 

 usually in prismatic 

 blocks near the base, and 

 contains casts of subcar- 

 bonilerous fossils belong- 

 ing to the genera sjnri- 

 jlr, orthis, lingula, pro- 

 ducttis, niiada, and bel- 

 krophon, also fragments 

 of tnlobitcs. At Mr. 

 McDonald's, on the head 

 waters of Mud creek, 13 

 miles from Batesville, 

 this member is but a few 

 ieet in thickness, and 

 rests upon dark, sheety 

 shales; the sandstone is 

 bedded in blocks from 

 three to four inches 

 thick, having an earthy 

 look, and low specific 



