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



Page Plate 



Tuscarora formation 473 



sandstone • • 28 



Tymochtee • • 28 



Tyrone • • 27 



Ulrich. E. O.. proposed stratigraphic classification 377 26 



Ulrich and Cushing. on Little Falls dolomite 643 



Ulrich, E. O.. and Schuehert. C on development of troughs 438 



Ulster 28 



Unconformities and overlaps. Diagrams illustrating 450 



Unconformity. Angular, illustration of 451 



Elvins-Potosi 629 



Jefferson City-Saint Peter . . '. 553 



Physical criteria of 462 



Stratigraphic 536 



Yellville-Saint Peter 553 



United States Geological Survey. Stratigraphic classification by . . 376 26 



Units. Nomenclature of stratigraphic 384 



Utica deposits. Age of 567 



black shale 521 



fauna 595 



shale 296. 525, 569 27 



transgression 372 



Utica -Lorraine fauna compared with Eden-Maysville fauna 510 



Utica-Trenton erosional unconformity 310 



Utican aspect of Maquoketa fauna 300 



Yalcour limestone 513 27 



Yanuxemia bed . . 27 



Varying time values of faunal breaks 511 



Vegetable fouling of seas 359 



Vermont white marble. Age of 444 



Viola limestone 305, 516, 523, 664 27 



Virginia basin. Central 562 



formations . . 27 



Vulcanism in Xew England region 442 



Wabash axis 562 



Walcott, C. D.. on Cambrian sections of the Cordilleran area 616 



correlation of Galena 524 



development of troughs 438 



Walden sandstone . . 29 



Waldron shale . . 28 



Wapsipinieon limestone mm 28 



Warping in Appalachian Valley 568 



Periods of recurrence of 603 



Warsaw formation 517, 58 2, 588 29 



position of 586 



Spergen fauna in 301 



