LIST OF ILLUSTRATIONS. 
FROM ORIGINAL SKETCHES IN THE FIELD.* 
WOOD-CUTS. 
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PAGE 
Gorge and Falls of Pigeon River: engraved by W. Roberts; on wood by C. E. Dopler, Frontispiece. 
Dike of Columnar Basalt, Grand Portage Bay, Lake Superior: engraved by Richardson & Cox: 
on wood by S. Wallin, Vignette. 
La Pointe and Bay of Madeline island, ee Souls: sigieved by N. nis on eed by ©. Gil- 
denmeister, . 
Natural Section of Bluffs of Lowct Piulaosoie hous: drawi and cngeuved on : ae - J. W. 
Louderback, 40 
Cliff of Lower Migrnesin Einestone, Phun Drocks ara sal cogenoed’ on woud by J. W. 
Louderback, : 2 
Outcrop of Lower Bandetone, eee engray aa by R. Telfer 5 on wed by J. B. Howell, - 43 
Hill of Alternations of Lower Sandstone and Magnesian Limestone: engraved ry R. Telfer ; on 
wood by A. Lawrie, 43 
Outlet of Lake Pepin: engraved e D. ¢. utter on oaa by is Elliot, , . 44 
Cap des Sioux, Lake faite: engraved by R. Telfer; 3 on wood by A. Lawrie, ‘ : » 45 
La Grange Mountain: ouurerol. by Richardson & Cox; on wood by S. Wallin, . ‘ 4... 20 
Amphitheatre of Sand: engraved by A. Sollin; on a by Devereux, . 5d 
Alternations of Lower Sandstone and Kiintsied Limestone, Iowa River; engrav = ” G. " Hof 
man; on wood by W. Croome, 57 
Castellated Appearance of Lower Ma gutsian Vinastens. ows Rive: Hews and engrav sa on weed 
y Devereux, _ 65 
Natural Wall and fiaztlons of Lower Macpcslocs Limestone jee iver: cure by rs Salita ; 
on wood by Devereux, ‘ 66 
Northern and Southern Slopes : Siecavid ty RK. Telfer ; 3 on wood iy A. Lawite, : 67 
Cliffs of Lower Magnesian Limestone, Iowa River; engraved Y W. B. Gihon; on we by W. 
Croome, 68 
Natural Wall of Senishons, Ricci: see gaa sured on ees by J. W. Tet heok, 
after a Sketch by Lewis, 70 
Remarkable Outline of Hills on “Turkey ea iaemiied by E.  i¢ Volum? on wood by C. E. 
Dopler, ; 74 
Outcrop of Tae Saruecten iced a Shell-beds, ethan poem acimpaeod by G. w Hoff. 
man; on wood by Devereux, 75 
Outcrop of Limestone on Shell Rock : Ges ae ote on weed by y Ww, Pedcrhank. Raa 
Region of Drift, Prairies of Northern Iowa: engraved by N. Orr; on wood by C. Gildenmester, 80 
View on the Upper Iowa: drawn and engraved on wood by J. Orr, 88 
Coneretions in Muscatine quarries: drawn and engraved on wood by W. B. Gihon 100 
Outline of Carboniferous rapgecrsa Biae Iowa: anaes by Bobbett & Edmonds; 3 on eed by 
Beckwith, . : 101 
* 
* Except when otherwise designated, by D. D. Owen and Richard Owen. 
