466 New York State Museum 



Elephant's tusk shells, 153, 167 

 Emmons, Ebenezer, cited, 267 

 Encrinal limestone, 21, 376, 389 

 Enfield shale, 403 

 Eolian rocks, 24 

 Eolian sands, 30 

 Erian, 371 

 Eskers, 28 



Esopus shales or grit, 382 

 Eurypterids, 262, 423 

 Extrusive igneous rocks, 63 

 Extrusive sheet, 65 



Fairchild, H. L., cited, 300, 418, 442, 447 



Fall Creek conglomerate, 406 



False bedding, 44 



Fanshaped folds, 53 



Fault breccias, 30 



Fault-line, 54 



Fault-plane, 54 



Fault scarp, 56 



Fault-surface, 54 



Fault zone, 54 



Faults, 54 



dips, 56 



gravity, 54 



normal, 54 



oblique, 56 



reverse, 54 



rotary, 56 



strike, 56 



thrust, 54 

 Feldspars, 68, 



orthoclase, 68 



plagioclase, 68 



potash, 68 



potash-soda, 69 



soda-lime, 69 

 Ferns, 436 

 Ferrous oxide, 23 



