72 Cincinnati Society of Natiual History. 



acid, showing it to to contain considerable carbonate of lime. But 

 at 1330 there was another change. The rock was decidedly arena- 

 cioiis and effervesced readily with hot acid only, showing a con- 

 sidrable per cent, of magnesia. The drillers called it "sand," and 

 to the eye it presented that appearance. As the drill went on to 

 1340, 1350, 1360 feet the material came up more and more finely 

 ground up, and more and more like sand. When 1365 feet had 

 been struck, and the drill was pulled out, the rope showed the 

 presence of about 180 feet of water in what had previously been a 

 a dry hole. A strong smell of sulphuretted hydrogen pervaded 

 the air, and inspection of the water showed it to be sulphur water 

 or Blue Lick. The material in this water was very finely ground 

 up, and resembled flour more than anything else. It was a dark 

 blue when wet, but changed on drying and on exposure to the air 

 to white. 



The 45 feet between 1280 and 13.25 marked the base of the 

 Trenton, and this may possibly be referable to the Chazy of New 

 York geologists. But the white, sandy rock beneath it, could be 

 referred to nothing but the Calciferous Sandrock which, in the 

 ordinary scale, lies below the Trenton. The presence of water in 

 the well will probably prevent its being bored deeper, unless 

 indeed it is so cased that the water is shut out. 



The section thus made shows the depth of the Trenton lime- 

 stone in this part of the State. With the exception of changes in 

 color, from light to dark, there was little difference in the rock for 

 about 450 feet. This is a magnesian limestone, its presence shown 

 by blow pipe tests made by Mr. Nelson Perry, Mining Engineer. 

 But the forty-five feet below the light colored rock was very differ- 

 ent, while that found still lower was more distinct still. Allowing 

 a few feet for discrepancies, it may be said with confidence that 

 the Trenton formation here is about five hundred feet thick. 



Comparatively few fossils were found in the drillings. A speci- 

 men of Afonticulipora 0' nealli was found at 375 feet. Fragments 

 of Orfhis, Zygospim, etc., at 96 feet. Another fragment of Orthis 

 from 790 feet, and a fragmentof coral, unidentified, from 1212 feet. 

 The subjoined notes on the specimens from different depths will 

 indicate the character of the rocks more particularly. These sam- 

 ples are from eighty-seven different depths, and represent quite 

 completely the changes in the strata. 



