DEPOSITS 



637 



Page Plate 



Deposits, Initial, peculiarities of 454 



of sychronous within same basin, Lateral change in char- 

 acter 477 



showing Atlantic connections 573 



Thickest distribution of 565 



Thickness in various systems of 602 



Time required for formation of 295 



Devonian . • 28 



Comparison of, with other eras 607 



black shale transgression 303 



coral faunas, Distribution of 509 



Deformative movements of 471, 474 



Deposits of 471, 475 



in Europe 471 



on Nashville dome 579 



system, Thickness of 383 



tilting 425 



time, Expansion of 380 



Devonian- Silurian overlap 307 



Devono-Waverlyan boundary 585* 



Diastrophic activity, Four grand periods of 477 



Classification of 407 



criteria 394, 534 



movements, Classification by 595 



periods, Neopaleozoic 470 



rhythm 599 



rhythm in relation to the duration of geologic ages. 601 



Varying effects on the strandline of 408 



Diastrophism, basis of stratigraphic classification 578 



Dicellomus appalachia 623 



nanus 623 



politus ? 623 



Dichograptus bed 652 



Dickeys section, Pennsylvania 327 



Dictyonema flabelliforme 443, 646, 679 



Dictyonema flabelliforme zone 652, 670 



Age of 678 



Didymograptus 663 



amplus 668 



artus 663 



bifidus 443, 668 



cf. bifidus 674 



bifidus zone 652, 678 



caduceus ( Salter) Rued 678 



caduceus nanus Rued (>7S 



euodus Lapworth 678 



extensus Hall 677 



filiformis Tullberg 677 



XUV— Bull. Geol. Soc. Am., Vol. 24, 1912 



