Reviews — Geological Map of North America. 565 



Nord." The map itself is entitled " Congres Geologique Inter- 

 national. Dixieme Session, 1906. Jose G. Aguilera, President. 

 Ezequiel Ordonez, Secretaire general. Carte Geologique de 

 I'Amerique du Nord. Dressee d'apres les sources officielles des Etats 

 Unis, du Canada, de la Republique du Mexique, de la Commission 

 du Chemin de Fer Intercontinental, etc. Henry Gannett, Geographe. 

 Bailey Willis, Geologue. Echelle 1 : 5,000,000, 1906." (Scale = 

 78-9 miles to one inch.) 



The map embraces the whole of North America, and includes 

 Alaska, the Parry Islands, Greenland, Iceland, Canada, United 

 States, Mexico, Guatemala, Honduras, Nicaragua, Costa Rica, 

 Panama, the West Indies, and part of Colombia and Venezuela. ' 

 By an extraordinary oversight the island of Cozumel off Yucatan is 

 omitted. Twenty-five distinctive colours are employed, the sub- 

 divisions being Effusive Eocks, Intrusive Eocks, Pre-Cambrian, 

 Eo-Algonkian, Neo-Algonkian, Metamorphic Palaeozoic, Palaeozoic, 

 Cambro-Ordovician, Ordovician, Silurian, Devonian, Carboniferous, 

 Mississippian, Pennsylvanian, Permian, Trias, Jurassic and Triassic, 

 Lower Cretaceous, Upper Cretaceous, Laramie and allied formations, 

 Eocene, Neocene, Miocene, Pliocene and Quaternary, Quaternary. 

 The Quaternary is only shown in localities where it completely 

 covers the subjacent formations. 



As one would naturally expect, there are blank areas in parts 

 of Alaska, North-West Canatla, Idaho, Nevada, Utah, Arizona, 

 California, New Mexico, Texas, Lower California, and the States 

 of Guerrero, Oaxaca, and Vera Cruz, and parts of Honduras, Costa 

 Eica, Nicaragua, and Panama. 



The map is beautifully printed, and consists of four sheets, each 

 28f inches (73 cm.) by 37i inches (94^ cm.), measured over the 

 engraved work. 



The comparative scantiness of place-names is a slight drawback 

 in a vei'y handsome and useful map. 



The colour index is in French and Spanish. 



This map is the result of a resolution proposed by the late 

 Professor I. C. Eussell at the Ottawa meeting of the Geological 

 Society of America, to the effect that it was desirable to prepare 

 a geological map of North America for the International Congress 

 at the city of Mexico. A committee was appointed, consisting of 

 Professor I. C Eussell (chairman), Professor F. D. Adams, 

 Sr. Jose G. Aguilera, Mr. C. W. Hayes, and Mr. Bailey Willis. 

 Mr. Bailey Willis was officially charged with the work of compiling 

 the map. 



The accompanying pamphlet by Mr. Aguilera consists of a title- 

 page and 22 pages of text (size of page 11 inches by 7| inches), 

 and gives a useful sketch of the geology of Mexico. Fuller details 

 will be found in the " Sinopsis de geologia Mexicana," Bulletins 4, 

 5, and 6 of the Inst. Geol. de Mexico, 1897, of which an abstract 

 appealed in Science Progress (New Series), vol. 1, 1897, pp. 609-615. 

 A pamphlet by Mr. Bailey Willis entitled " Carte geologique de 

 I'Amerique du Nord " (and in English, " Geological Map of North 



