TABLE OF CONTEXTS. 



Chapter I. 



Page. 



Physical geography of the county ; townships ; 

 towns and villages ; mountains and hills ; rivers, 



creeks and runs ; canal and railroad levels ; valleys ; 1 



Chapter II. 



Geological structure of the county ; subplications ; 



faults ; table of formations ; 31 



Chapter III. 

 Description of the formations. 



III. Utica and Hudson river shales, 43 



IV. Oneida and Medina sandstones, 43 



Va. Clinton group, 44 



Comparison with New York, 46 



Clinton lower green shale, . 47 



Block ore and iron sandstone, 48 



Clinton upper shale, 48 



Sand rock and sand vein ore bed, 49 



Niagara group wanting, 52 



Vb. Onondaga red and variegated shales, . . 53 



Bloomfield sandstone, 54 



Onondaga gray shales, 55 



Bridgeport sandstone, 57 



VI. Lower Helderberg group, 58 



VII. Oriskany sandstone, 62 



Upper Helderberg wanting 64 



VHIb. Marcellus limestone and black shale, .... 64 

 2 Y 2 . (xviiF*.) 



