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CONTENTS 
FIGURES 
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1. Ideal form of laccolith. 
2. Cross-section of typical laccolith. 
3. Cuneiform laccolithic structure. 
4. Type form of Bysmalith. 
5. Stratigraphic relations of Black Hills Tertiaries. 
6. Sierra del Oro horst. 
7. Cross-section of San Ysidro laccolith. 
8. Cross-section of Tuertos laccolith. 
9. Bysmalithic aspects of Ortiz laccolith. 
10. Transverse section of Los Cerrillos laccolith. 
11. Geological directrix of isostasy. 
12. Magnitude of Siouan fold. 
13. Lateral displacement of dike. 
14. Relations of laccoliths and sills. 
15. Locations of natural bridges of Utah. 
16. Grand stairway of Utah. 
17. Genesis of natural bridges. 
18. Relations of Galena dolomite and Trenton limestone. 
19. Cycles of groundwater circulation. 
20. Jaw of new peccary. 
21. Peneplains of Colorado Rockies. 
22. Sketch-map of Talladega Slates area of Alabama. 
23. Faulting in Colemanite beds. 
24. Geological sketch-map of Patagonia. 
25. Faulting of Cretacic strata in southwestern Iowa. 
