ILLUSTRATIONS. 



FTGITRES, IN PART I. 



Page. 



Fig. 1. Section of the canyon of the Little Colorado, Arizona 38 



2. Section of the Moencopie Wash, Arizona 39 



3. Section of the lower Little Colorado Valley, Arizona 41 



4. Section through Winslow, Arizona - . - 41 



5. Section near Leroux Wash, Arizona - 42 



6. Section through the Petrified Forest of Arizona 43 



7. Section of Red Butte 44 



S. Geological column of the Older Mesozoic of Arizona - 45 



9. Section of Cow Creek, Nickel Mountain, and Buck Peak, Douglas County, Oreg 47 



10. Potomac exposure on Sixteenth street, Washington, D. C 387 



1 1 . Columnar section of the Potomac formation 598 



PLATES. IN PART II. 



Plate 



Coniferous plants from the Trias of Arizona i-ii i 



Sketch map of the Little Colorado Valley, Arizona, and adjacent regions iv 



Sketch map of the Buck Mountain region and Cow Creek Valley, Douglas County, Oreg v 



Jurassic liverworts and ferns from Oregon v i 



Jurassic ferns from Oregon vii-xi v 



Jurassic ferns and Equiseta from Oregon xv 



Jurassic cycads from Oregon xvi-xxvni 



Jurassic cycads and Williamsonias from Oregon xxix 



Jurassic Gingkos from Oregon xxx-xxxill 



Jurassic Gingkoacese and Taxaceas from Oregon xxxiv 



Jurassic conifers from Oregon xxxv, xxxvi 



Miscellaneous Jurassic plants from Oregon xxxvti 



Jurasso-Cretaceous plants from Oregon and Alaska xxxviii 



Jurasso-Cretaceous ferns from Cape Lisburne, Alaska xxxix-XLni 



Jurasso-Cretaceous cycads and Gingkoaceae from Cape Lisburne, Alaska xliv 



Jurasso-Cretaceous conifers from Alaska, Montana, and California XLV 



9 



