628 E. O. ULRICH INDEX TO 



Page Plate 



Bellefonte basin 656 



dolomite 552, 553, 657 27 



section 657 



Beloit dolomite • • 27 



Belt series • 468 



Berea grit 527 29 



sandstone 474 



Bertie waterlime 523 



Beyrichia 505 



Bigby formation 418 



limestone 416 27 



Big Fork limestone 677 



Bigborn Mountains erosion 308 



Billingsella coloradoensis 623 



major ? 623 



Birdseye ; see Lowville. 



Birdsville formation 476 29 



Birmingbam Valley formations . . 27 



Black Hand conglomerate . . 29 



Black River epocb 567 



group 379, 382, 443 27 



use of term 391 



Black River-Trenton formations interfingering 5'57 



invasions, map 368 



Black muds, now forming 358 



Black sbale deposits, distribution 356 



deposition, Cause of 359 



significance 356 



Black sbale faunas 358, 595 



Blakely sandstone 677 



Blaylock sandstone 677 



BJoomsburg sandstone 522 28 



Biount group - 379, 382, 413. 576, 627 27 



( Upper Chazyan ) sedimentation 567 



Blue Spring section, Pennsylvania 326 



Bluestone formation 476 29 



Bob 28 



Body deformation causing vertical movement of land and sbifting 



of continental seas 394 



Bolbocephalus seelyi ? 670 



Bonneterre dolomite 623 27 



Boone chert 427, 593 29 



Boreal Invasions, Diagram of 346 



Boulders ice-transported in Caney shale 361 



Boundaries. Criteria for drawing 290 



of geological ages 581 584 



Bowing <>f (lie Appalachian tract 565 



Bowling Green dolomite 28 



Boyle limestone 28 



Brachiopods, distribution 502 



