PAULDING COUNTY. 337 



Zanthoxylum Americanum — Prickly Ash Mill. 



Gleditschia triacanthos — Honey Locust L. 



Asimina triloba — Pawpaw Dunal. 



Euonymus atropurpureiis — Wahoo Jacq. 



Carpinus Americana — Water Beech Michx. 



Ulmus fulva — Slippery Elm Michx. 



Celtis occidentalis. — Hackberry ., L. 



Cercis Canadensis — Judas Tree L. 



Pyrus coronaria — Apple L. 



Amelancliier Canadensis — June Berry Tour, and Gray. 



GEOLOGICAL STRUCTURE. 



The rocks that have been identified in Paulding county range from the 

 Waterlime to the Hamilton, including both. The geographical limits 

 of each formation, as represented on the accompanying map, are largely 

 conjectural, owing to the very unfavorable surface features that preclude 

 detailed examination, as well as to the uniformly undisturbed condition 

 of the Drift sheet. There is some evidence of the occurrence of a large 

 outlier of the Upper Corniferous, or Hamilton, in the central portion of the 

 county, or, it may be, a long spur from the main strike of the formations. 

 It is disregarded in the coloring on the map. The following arrange- 

 ment represents the formations in the order of their superposition, 

 according to the nomenclature of the Ohio Survey : 



Corniferous, 



Oriskany, 



Waterlime. 



Of these the New York equivalents are represented in the following 

 list.* (See Geology of Delaware County.) 



Tully limestone, 



Hamilton shaly limestone, ] 



Corniferous limestone, TWr«r.?oT» 



Onondaga limestone, f Devonian. 



Oriskany limestone, J 



Waterlime (of the Lower Helderberg group). 



The Ohio " Corniferous " is separable into four distinct and well-defined 

 parts, the characters of which are persistent throughout the Fourth Dis- 

 trict. These four parts above represented, by New York equivalents, 

 are believed to correspond with well-known members of the Devonian. 



* I am compelled to say that for the classification adopted in the above schedule 

 Prof. Winchell is alone responsible, as I cannot fully indorse it until it shall be sus- 

 tained by further (evidence than has yet been procured. The shale which he calls the 

 " Olentangy shale " has as yet yielded no fossils, and I see no good reason for sepa- 

 rating it from the Huron. The rock which he regards as the equivalent of the Tully 

 limestone may be so, but it has as yet been identified by no fossils of the Tully lime- 

 stone. It is unquestionably Hamilton, as I have found in it elsewhere Pterineaflabella, 

 Tropidt>lq>tus carinalus, and Nyassa arguta. 



The " Hamiliton limestone " — No. 4, of Prof. Winchell's section — can hardly be re- 



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