LIST OF THE 



PRINCIPAL AUTHORITIES FOR THE ILLUSTRATIONS IN THIS WORK, 



AND THE BOOKS FROM WHICH THEY HAVE BEEN TAKEN. 



Agassiz, L. Etudes sur les Glaciers ; Poissons Fossiles. 



Ashburner, Charles A. Anthracite Fields of Pa. 



Author. American Journal of Science, III, 1872-'89; also many (about 

 150) diagrammatic illustrations throughout this work. 



Bailey, J. W. Am. Jour, of Sci., II, i. 



Beecher. Am. Jour, of Sci., 1889. 



Bradley, F. H. Geological Chart of the U. S. 



Brogniart, A. Histoire des Vegetaux Fossiles. 



Buckland, W. Bridgewater Treatise. 



Chamberlin, T. C. Kettle Moraine. Trans. Wis. Acad. Sci., 1879. 



Conrad, T. A. Jour. Acad. Sci., Philadelphia. 



Cope, E. D. Hayden's U. S. Geog. and Geol. Survey, vol. ii — Cretaceous 

 Vertebrates; Newberry's Ohio Survey Pal. — Reptiles of the Coal; Proc. Am. 

 Phil. Soc, vols, xvii and xix — Permian and Jurassic Reptiles; Origin of the 

 Fittest. 



Daddow, S. H. Coal, Iron, and Oil. 



Dana, J. D. Wilkes's U. S. Explor. Exped. — vol. on Geology; Manual of 

 Geology. 



Davis, W. M. Trias of Conn. River. Am. Jour, of Sci., 1889. 



Dawson, J. W. Acadian Geology. 



De la Beche, H. Geological Observer — Sections and Views of Geological 

 Phenomena. 



De la Noe and De Margerie. Les Formes du Terrain. 



De Margerie and Heim. Dislocation de l'Ecorce Terrestre. 



D'Orbigny, A. Paleontologie et Geologie. 



Emmons, E. Rep. Geol. of N. Y. ; Rep. Geol. of N. C. 



Ewing. Seismograph. 



Favre, Prof. Alph. Archives des Sciences, vol. lxii. 



Fontaine, W. M. Flora of Potomac Formation, U. S. Geol. Survey. Mono- 

 graph. 



Forbes, J. Alps of Savoy. 



Foster and Whitney. Rep. on Geology of L. Superior District. 



Fritsch. Permian Fauna. 



