668 E. O. ULRICH INDEX TO "REVISION OF PALEOZOIC SYSTEMS" 



Page Plate 

 Wisconsin dome 420 



Formations in . . 27, 28 



Wisconsin-Illinois lead district. Formations of . . 27 



Withdrawal of sea. Physical evidence of 461 



Wolcott limestone . . 28 



Woodford formation. Oklahoma 303 29 



shales 527, 531 



Wykoff limestone 28 



Wytheville axis 562 



as a barrier 564 



Yellville dolomite 629 



fauna 552 



formation 420, 421. 480, 667 27 



oscillations 420 



