INDEX. 



Absaroka Eidges, 515, 517, 531, 536 



Acrotreia, 616 



Actceonina prosocheila, 305 



Actccon looosteri, 304 



Admetopsis rhombo'ules, 317 



Admetopsis subfusiformis, 318 



Agnostus josepha, 61(3 



Alkali, analyses of, 150 



Allen, Prof. J. A., 126 



Alpine Star Peak Trias, 625 



Altitudes, 681 



Analyses. 590, 592, 601 



Analysis of deposit at Steamboat Spring, 



590 

 Anchura haydeni, 311 

 Anchura miidgeana, 312 

 Anchura ruida, 312 

 Anchura prolabiata, 313 

 Anderson's Gulch, 396 

 Anisomyon centrale, 303 

 Appendix to Eeport of A. C. Peale, 645 

 Arable areas, 704 



Arable land of Green River District, 704 

 AraMopsis, 533 



Areestes cirratus, 560, 624, 627 

 Archaean areas. 474 

 Archaean rocks, 412, 419, 449 

 Archaean rocks of Green Eiver District, 613 

 Archimedes, 619 



Area and boundaries of Teton District, 323 

 Area of Green River District, 511 

 Asaphus (Megalaspis) ? goniocercus, 616 

 Aspen Ridge, 558, 596 

 Athyris subtilita, 584, 598, 620 

 Aulopora, 609, 620 

 Auriferous gravels, 404 

 Aviculopecten, 562, 577 

 Aviculopecten alius, 558, 626 

 Aviculopecten idahoensis, 560, 575, 577, 585, 



624,626,627,628 

 Aviculopecten pealei^ 547, 624, 627 

 Aviculopecten rectus, 624, 627 

 Azimuths and distances, 662-667, 672 

 Bad lands, 526, 528, 639 

 Bainbridge, Captain, 360, 509, 519 

 Bannack Range, 565, 570, 701 

 Bannack Reservation, 697 

 Barbatia coalvillensis, 286 

 Baroda subelliptica, 294 

 Baroda wijomingensw, 293 

 Basalt, 330, 351, 406, 408, 513, 515, 519, 561, 



562, 564, 566, 571, 583, 596, 597, 601, ,643, 



699 

 Basaltic Plateau, 356 

 Basalt Valley, 515, 562, 597 

 Basin Creek Springs, 591 

 Basin Eidges, 349 

 Basin Spring, 591 

 Bathyurellus {Asapldscus) bradleyi, 616 



Bathyurellus (DikeUocephalus)? truncatus, 



616 

 Bathyurus, 568, 616 

 Bear Creek, 415 



Bear Creek, Colorado, fossils from, 193 

 Bear Lake, 513, 589, 698 

 Bear Lake Plateau, 514, 520, 586 

 Bear Lake Plateau, geology of, 582 

 Bear Lake Plateau, Jura Trias of, 623 

 Bear Lake Valley, 587, 589 

 Bear Marsh, 520, 589 

 Bear Eiver, 513, 573, 589, 601, 602, 609 

 Bear Eiver area, geology of, 573 

 Bear Eiver Basin, 424 

 Bear River Bend, 590 

 Bear River, drainage area of, 697 

 Bear River, "Gates of" 513, 605 

 Bear River, Laramie Group, 578, 582 

 Bear River Marsh, 587 

 Bear River, Middle Canon of, 602 

 Bear River Mountains, 513, 520 

 Bear River Range, 514, 702 

 Bear River Range Carboniferous, 618 

 Bear River Range, geology of, 598 

 Bear River Region, Post-Cretaceous of, 630 

 Bear River, Upper Valley of, 574 

 Bear River Valley 514, 520, 665, 666 

 Bear River Valley, fossils from, 241 

 Beaver Creek, 553 

 Beer Springs, 590, 591 

 Belemnites beds, 624 

 Belemnites densus, 623,626 

 Bell Brothers, 536 

 Bell's Pass, 536 

 Bennington, 520, 587, 588 

 Big Sandy, 513, 516 

 Big Sandy River, geology, 525 

 Bijou Creek, fo'ssils from, 190 

 Bijou Creek, section at, 189 

 Bilk's Gulch, 396, 404 

 Bitter Creek, fossils from, 215 

 Bitterroot Creek, 529 

 Black Butte, 664 



Black Buttes Station, fossils from, 216 

 Black Buttes Station, section at, 222 

 Blackfoot Basin, 695 

 Blackfoot Basin . geology of, 556 

 Blackfoot Basin, Jura Trias of, 623 

 Blackfoot Mountains, 338 

 Blackfoot Peak, 338, 340 

 Blackfoot Peak, section through, 339 

 Blackfoot Range, 328. 338, 346, 350, 477 

 Blackfoot River, 337, 513, 514, 695 

 Blackfoot River, northern branches of, 559 

 Blackfoot River, west side of, 561 

 Black Rock Creek, 456 

 Bloomiugton, 587 

 Bloomington Creek, 599 

 Blue Spring Hills, geology of, 609 



711 



