238 



CHARLES KEYES 



one of the great critical sections of the country. It is in reality 

 the standard succession of the Western continent. It is a rock 

 sequence such as James Hall vainly sought in his lifelong endeavor 



Fig. 3. — Uncovered laccolith of Multiplex Ortiz 



Fig. 4. — Zuni Salt Lake: birth of a volcano. Two cinder cones on floor of 

 explosive crater, 600 feet deep. 



to establish a standard stratigraphy for the world. It thrice 

 transcends the united sections of Murchison, Sedgwick, and Lons- 

 dale. With the depositional equivalents of its numerous hiatuses 



