GEOLOGY 
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4 * 
OF 
NORTH AMERICA; 
WITH 
TWO REPORTS 
ON 
THE PRAIRIES OF ARKANSAS AND TEXAS, 
THE ROCKY MOUNTAINS OF NEW MEXICO, AND THE SIERRA NEVADA 
OF CALIFORNIA, 
ORIGINALLY MADE FOR THE UNITED STATES GOVERNMENT. 
BY 
JULES MARCOU 
PROFESSOR OP GEOLOGY IN THE FEDERAL POLYTECHNIC SCHOOL OF SWITZERLAND; FORMERLY UNITED STATES GEQbOGIST; 
AND EX-GEOLOGIST OF THE « J.4RDIN DES PLANTES » OF PARIS. 
„ll n’est auoun voyageur qui ne puisse faire queiqu« boime observatiun ct appurtei an 
moins une pierre digne d'entrer dans la construction de ce grand 
iH. B. de Saussure, Voyages dans les Alpes, tome IV, p. 529.) 
.,A geologist must not take anything upon report; he must see with bis own eye.s . 
and carry into all parts of his subject a unity of observation 
(P. I Martin, A Geological JHernoir ana pari of Western Sussex) 
ZIRICH 
PRINTED FOR THE AUTHOR, BY ZURCHER AND FURRER. 
AND SOLD BY FRIEDRICH KLINCKSIECK, N° II, RUE DE LILLE, A PARIS. 
NEW YORK , WiLEV and Haisted , Broadway. — LONDON , Trubker and Co ; Williams and Noroaie. 
LEIPZIC. Wilhelm Ekgelmann. 
1858. 
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