CONTENTS 287 



Page 

 Part 111. Stratigraphie laxoiiouiy 



Principles of classitication 574 



General discussion 574 



Basis of proposed revision of stratigraphic taxonomy 577 



Discussion of the factors 577 



Cardinal principle of the new stratigraphy 57!) 



Method of dividing geologic time and deflniteness of time units. . . 580 

 Revision of methods as well as facts of stratigraphic classifica- 

 tion 581 



Why the Waverlyan and Tennessean are systems and not series. . 582 



Consistency of method in drawing stratigraphic boundaries 583 



Discussion 583 



Prevailing inconsistencies in method 58fi 



Examples 58(J 



The Warsaw is of Tennessean. not Waverlyan, age 580 



The relations of the Sainte Genevieve to the Chesterian and 



Meramecian 588 



The principle of introductory facies of faunas and deposits 590 



Discussion and illustrations 590 



The first appearance of fossil species and faunas 592 



Early Tennessean beds included in the "Boone" 593 



Locus of faunal evolution and antecedent occurrences 594 



Classification by diastrophic movements 595 



Maximum, major, and minor movements 595 



Chamberlin and Salisbury's views on the natural basis of time 



division 597 



Rhythm in recurrence of geological phenomena 599 



General discussion 599 



Diastrophic rhythm in relation to the duration of geologic ages 601 



Recurrence of geographic patterns 002 



Recurrence of periods of warping 603 



Sequence, grouping, and nomenclature of stratigraphic units in south- 

 eastern North America 008 



General discussion. 008 



Generalized statement of ])roi)Osed changes 009 



Eoi)aleoz()ic formations Oil 



Cambrian system or period Oil 



Definition of the term Cambrian Oil 



Relations of the Cambrian to the Ozarkian 014 



Major divisions of the Cambrian 616 



r^wer Cambrian deposits in southeastern North America 017 



Acadian or middle Cambrian faunas and deposits 019 



Middle Cambrian deposits in the Appalachian Valley 021 



Upper Cambrian deposits in America 022 



The Appalachian sequence 022 



The upper Cambrian west of Mississippi River 023 



Taxonomic relations of the lower Cambrian to the middle and 



upper Cambrian 625 



Ozarkian period or system 627 



Definition of the term 627 



