STRUCTURAL GEOLOGY OF NORTH AMERICA 



MAPS FOR COLLATERAL USE 



The book is not intended to stand entirely alone. The reader or in- 

 structor should have the following maps for ready reference, preferably 

 mounted and hanging on the wall at short range. 



The Geologic Map of the United States, 1932 edition 



The Geologic Map of Canada, 1957 edition 



The Geologic Map of North America, 1946 edition 



The Tectonic Map of the United States, 1944 edition 



Landforms of the United States, 1939. Map by Erwin Raisz 



The Tectonic Map of Canada, 1950 



The Geologic Map of South America, 1950 



These maps will be referred to repeatedly. Although the book contains 

 many illustrations, it does not reproduce the features of the above maps, 

 and if they are not consulted when referred to, the continuity will be 

 interrupted, the evidence not clearly understood, and perhaps the con- 

 clusions not appreciated or properly evaluated. 



AUTHORITY FOR STRATIGRAPHIC CORRELATIONS 



Most field work in structural geology is based on previous paleontologic 

 and stratigraphic work. A report on the structural geology of an area is 

 not considered worth while unless the formations are dated. The principal 

 method of dating is by the fossils present, and therefore, the structural 

 geologist is dependent upon the paleontologist, except in Precambrian 

 terranes. It is conceivable, but not probable, that a sequence of deforma- 

 tional events could be worked out in a local area without reference to 

 fossils or to nearby stratigraphic columns, but to date the events and to 

 relate them to others in widely separated areas is generally impossible 

 without fossils. 



A series of articles has appeared in the last few years in the Bulletins 

 of the Geological Society of America that summarize the formational cor- 

 relations throughout North America for each geologic period. They have 

 been prepared by the Committee on Stratigraphy of the National Re- 

 search Council, and are taken in this book as authority in relating the 



numerous orogenic episodes throughout the continent. They are as 

 follows : 



Chart No. 



1. Cambrian formations of North America, Howell et al., Bull. Geol. Soc. 

 Am., vol. 55, pp. 993-1004, 1944. 



2. Ordovician formations of North America, W. H. Twenhofel et al., Bull. 

 Geol. Soc. Am., vol. 65, No. 3, 1954. 



3. Silurian formations of North America, C. K. Swartz et al., Bull. Geol. Soc. 

 Am., vol. 53, pp. 533-538, 1942. 



4. Devonian formations of North America, G. Arthur Cooper et al., Bull. 

 Geol. Soc. Am., vol. 53, pp. 1729-1794, 1942. 



5. Mississippian formations of North America, J. Marvin Weller et al., Bull. 

 Geol. Soc. Am., vol. 59, pp. 91-196, 1948. 



6. Pennsylvania formations of North America, R. C. Moore et al., Bull. Geol. 

 Soc. Am., vol. 55, pp. 657-706, 1944. 



7. Permian formations of North America, A. A. Baker et al., Bull. Geol. Soc. 

 Am., vol. 71, pp. 1763-1801, 1960. 



8. Cretaceous formations of the western interior of the United States, Bull. 

 Geol. Soc. Am., vol. 63, pp. 1011-1044, 1952. 



9. Cretaceous formations of the Greater Antilles, Central America and Mexico, 

 R. W. Imlay, Bull. Geol. Soc. Am., vol. 55, pp. 1005-1046, 1944. 



10. Marine Cenozoic formations of western North America, C. E. Weaver 

 et al, Bull. Geol. Soc. Am., vol. 55, pp. 569-598, 1944. 



11. Cenozoic formations of the Atlantic and Gulf Coastal Plain and Caribbean 

 Region, C. Wythe Cooke et al., Bull. Geol. Soc. Am., vol. 54, pp. 1713- 

 1724, 1943. 



Additional correlations charts 



Thickness and general character of the Cretaceous deposits in the western 

 interior of the United States, Preliminary Map No. 10, J. B. Reeside, Jr., U.S. 

 Geol. Survey, Oil and Gas Investigations, 1944. 



Nomenclature and correlation of the North American Continental Tertiary, 

 H. E. Wood, 2nd, et al., Bull. Geol. Soc. Am., vol. 52, pp. 1-48, 1941. 



Paleotectonic maps of the Jurassic system, U.S. Geol. Survey, Miscellaneous 

 Geological Investigations, Map 1-175, 1956. 



Paleotectonic maps of the Triassic system, U.S. Geol. Survey, Miscellaneous 

 Geological Investigations, Map 1-300, 1959. 



EXERCISES 



Four types of assignments and exercises are feasible. The first is the 

 reading and reporting of original articles in the literature. It is hoped that 



